Compounds and compositions as toll-like receptor 7 agonists

ABSTRACT

The invention provides a compounds, immunogenic compositions and pharmaceutical compositions comprising such compounds and methods of using such compounds to treat diseases or disorders associated with Toll-Like Receptor 7 activity.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 371 U.S. national phase application of international application number PCT/US2015/028264 filed 29 Apr. 2015, which application claims the benefit of priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 61/987,321, filed 01 May 2014, the disclosure of these which is incorporated herein by reference in its entirety and for all purposes.

FIELD OF THE INVENTION

The invention relates to compounds which are Toll-Like Receptor 7 (TLR7) agonists, compositions containing such compounds and methods of using such compounds.

BACKGROUND OF THE INVENTION

Early detection of specific classes of pathogens is accomplished by the innate immune system with the help of pattern recognition receptors (PRRs). The detected pathogens include viruses, bacteria, protozoa and fungi, and each constitutively expresses a set of class-specific, mutation-resistant molecules called pathogen-associated molecular patterns (PAMPs). These molecular markers may be composed of proteins, carbohydrates, lipids, nucleic acids or combinations thereof, and may be located internally or externally. Examples of PAMPs include bacterial carbohydrates (lipopolysaccharide or LPS, mannose), nucleic acids (bacterial or viral DNA or RNA), peptidoglycans and lipotechoic acids (from Gram positive bacteria), N-formylmethionine, lipoproteins and fungal glucans.

Pattern recognition receptors have evolved to take advantage of three PAMP qualities. First, constitutive expression allows the host to detect the pathogen regardless of its life cycle stage. Second, the PAMPs are class specific, which allows the host to distinguish between pathogens and thereby tailor its response. Third, mutation resistance allows the host to recognize the pathogen regardless of its particular strain.

Pattern recognition receptors are involved in more than just recognition of pathogens via their PAMPs. Once bound, pattern recognition receptors tend to cluster, recruit other extracellular and intracellular proteins to the complex, and initiate signaling cascades that ultimately impact transcription. Additionally, pattern recognition receptors are involved in activation of complement, coagulation, phagocytosis, inflammation, and apoptosis functions in response to pathogen detection.

Pattern recognition receptors (PRRs) may be divided into endocytic PRRs or signaling PRRs. The signaling PRRs include the large families of membrane-bound Toll-like receptors (TLRs) and cytoplasmic NOD-like receptors, while the endocytic PRRs promote the attachment, engulfment and destruction of microorganisms by phagocytes without relaying an intracellular signal, are found on all phagocytes and mediate removal of apoptotic cells. In addition, endocytic PRRs recognize carbohydrates and include mannose receptors of macrophages, glucan receptors present on all phagocytes and scavenger receptors that recognize charged ligands.

SUMMARY OF THE INVENTION

Provided herein are compounds and pharmaceutical compositions thereof, which are agonists of toll-like receptor 7 (TLR7). Such TLR7 agonists are immune potentiators. Also provided herein are immunogenic compositions that contain such TLR7 agonists.

In one aspect such compounds, and the pharmaceutically acceptable salts, individual isomers and mixture of isomers thereof, have a structure according to Formula (I):

wherein:

-   R¹ is —NHR⁶ or —NHCHR⁶R⁹; -   R³ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷),     —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,     -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl; -   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷),     —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,     -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl;     -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl;         -   or when R⁴ is H, then R³ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,             —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH,             —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH             or tetrazolyl; -   L₁ is —(CH₂)_(m)—; -   L₂ is —(CH₂)_(m)—; -   L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—; -   R⁶ is —C₃-C₆alkyl; -   R⁷ is —C₁-C₃alkyl; -   R⁹ is L₁OH; -   each R¹¹ is independently selected from —OH; -   R¹² is     -   a) an unsubstituted tetrazolyl;     -   b) a tetrazolyl substituted with -L₁C(═O)OH;     -   or     -   c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms         independently selected from N and O substituted with —C(═O)OH; -   each m is independently selected from 1, 2, 3, and 4, -   and -   each n is independently selected from 0, 1, 2, 3, and 4.

In certain embodiments, the compound of Formula (I) is a compound of Formula (Ia) or Formula (Ib):

In certain embodiments of the compounds of Formula (I),

-   R¹ is —NHR⁶ or —NHCHR⁶R⁹; -   R³ is H, —OL₂C(═O)OH or tetrazolyl; -   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷),     —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,     -L₇C(═O)OH or tetrazolyl;     -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH or tetrazolyl;         -   or when R⁴ is H, then R³ is —OL₂C(═O)OH or tetrazolyl; -   L₁ is —(CH₂)_(m)—; -   L₂ is —(CH₂)_(m)—; -   L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—; -   R⁶ is —C₃-C₆alkyl; -   R⁷ is —C₁-C₃alkyl; methyl -   R⁹ is L₁OH; -   each R¹¹ is independently selected from —OH; -   R¹² is     -   a) an unsubstituted tetrazolyl;         -   b) a tetrazolyl substituted with -L₁C(═O)OH;         -   or         -   c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms             independently selected from N and O substituted with             —C(═O)OH; -   each m is independently selected from 1, 2, 3, and 4, -   and -   each n is independently selected from 0, 1, 2, 3, and 4.

In certain embodiments of the compounds of Formula (Ia) or Formula (Ib),

-   R¹ is —NHR⁶ or —NHCHR⁶R⁹; -   R³ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷),     —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,     -L₇C(═O)OH, —OL₂C(═O)OH,

-   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷),     —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,     -L₇C(═O)OH, —OL₂C(═O)OH,

-   -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

-   -   or when R⁴ is H, then R³ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

L₁ is —(CH₂)_(m)—;

-   L₂ is —(CH₂)_(m)—; -   L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—; -   R⁶ is —C₃-C₆alkyl; -   R⁷ is —C₁-C₃alkyl; -   R⁹ is L₁OH; -   each R¹¹ is independently selected from —OH; -   R¹² is

-   each m is independently selected from 1, 2, 3, and 4, -   and -   each n is independently selected from 0, 1, 2, 3, and 4.

In certain embodiments of the compounds of Formula (I), Formula (Ia) and Formula (Ib),

-   R¹ is —NHR⁶ or —NHCHR⁶R⁹; -   R³ is H, —OL₂C(═O)OH,

-   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷),     —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,     -L₇C(═O)OH

-   -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH,

-   -   or when R⁴ is H, then R³ is —OL₂C(═O)OH,

-   L is —(CH₂)_(m)—; -   L₂ is —(CH₂)_(m)—; -   L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—; -   R⁶ is —C₃-C₆alkyl; -   R⁷ is —C₁-C₃alkyl; -   R⁹ is L₁OH; -   each R¹¹ is independently selected from —OH; -   R¹² is

-   each m is independently selected from 1, 2, 3, and 4, -   and -   each n is independently selected from 0, 1, 2, 3, and 4.

In certain embodiments of the compounds of Formula (I), Formula (Ia) and Formula (Ib), L₁ is —CH₂—; L₂ is —CH₂— or —CH₂CH₂—; L₇=—(CH₂)₂(CHR¹¹CH₂)₂—; R⁶ is —C₄alkyl or —C₅alkyl; R⁷ is methyl, ethyl or propyl, and R¹¹ is OH.

In certain embodiments of the compounds of Formula (I), Formula (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is —(CH₂)_(m)—; R⁶ is —C₃—C₆alkyl; R¹² is

-   -   a) an unsubstituted tetrazolyl;     -   b) a tetrazolyl substituted with -L₁C(═O)OH;     -   or     -   c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms         independently selected from N and O substituted with —C(═O)OH,

and

each m is independently selected from 1, 2, 3, and 4.

In certain embodiments of the compounds of Formula (I), Formula (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is —CH₂— or —CH₂CH₂—; R⁶ is —C₅alkyl; and

R¹² is

In certain embodiments of the compounds of Formula (I), Formula (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is —CH₂— or —CH₂CH₂—; R⁶ is —C₅alkyl; and

R¹² is

In certain embodiments of the compounds of Formula (I), Formula (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂C(═O)OH; L₂ is —CH₂— or —CH₂CH₂—; and R⁶ is —C₅alkyl.

In certain embodiments of the compounds of Formula (I), Formula (Ia) and Formula (Ib) the compound is selected from:

-   5-(5-((1H-tetrazol-5-yl)methoxy)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; -   (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)pentan-1-ol; -   5-(5-(2-(1H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   N4-hexyl-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   (S)-2-((2-amino-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; -   2-(5-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)-2H-tetrazol-2-yl)acetic     acid; -   5-(2-methoxy-4-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   (S)-2-((5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; -   5-(5-(difluoro(1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetic     acid; -   (3R,5R)-7-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-3,5-dihydroxyheptanoic     acid; -   2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic     acid; -   (S)-2-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic     acid; -   3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic     acid; -   (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonic     acid; -   methyl hydrogen     (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate; -   (E)-3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylic     acid; -   3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic     acid; -   (S)-3-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic     acid; -   (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic     acid; -   (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic     acid, and -   2-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetic     acid.

In certain embodiments of the compounds of Formula (I), Formula (Ia) and Formula (Ib) the compound is selected from:

-   2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic     acid; -   3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic     acid; -   5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   5-(5-(2-(1H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic     acid, and -   (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic     acid.

Another aspect, provided herein are methods of using compounds of Formula (I), Formula (Ia) and Formula (Ib), and pharmaceutical compositions comprising such compounds of Formula (I), Formula (Ia) and Formula (Ib).

Another aspect provided herein are pharmaceutical compositions that include a therapeutically effective amount of a compound of Formula (I), Formula (Ia) or Formula (Ib), and a pharmaceutically acceptable carrier. In certain embodiments of such pharmaceutical compositions, the pharmaceutical composition is formulated for intravenous administration, intravitrial administration, intramuscular administration, oral administration, rectal administration inhalation, nasal administration, topical administration, ophthalmic administration or otic administration. In other embodiments, the pharmaceutical compositions are in the form of a tablet, a pill, a capsule, a liquid, an inhalant, a nasal spray solution, a suppository, a solution, an emulsion, an ointment, eye drop or ear drop. In other embodiments, such pharmaceutical compositions further include one or more additional therapeutic agents.

Another aspect provided herein are medicaments for treating a patient with a disease or disorder associated with TLR7 receptor activity, and such medicaments include a therapeutically effective amount of a compound of Formula (I), Formula (Ia) or Formula (Ib).

Another aspect provided herein is the use of a compound of Formula (I), Formula (Ia) or Formula (Ib) in the manufacture of a medicament for treating a disease or disorder associated with TLR7 activity. In certain embodiments of such uses the disease is an infectious disease, a viral infectious disease, an inflammatory disease, a respiratory disease, a dermatological disease, an autoimmune disease, a cell-proliferative disease or cancer. In certain embodiments of such uses the disease is asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDS), ulcerative colitis, Crohn's disease, bronchitis, dermatitis, actinic keratosis, basal cell carcinoma, bladder cancer, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, breast cancer, HIV, hepatitis, hepatitis C or lupus. In certain embodiments of such uses the disease is hepatitis B, hepatitis C, colorectal cancer or hepatocellular carcinoma.

Another aspect provided herein are methods for activating a TLR7 receptor, wherein the method includes administering to a system or a subject in need thereof, a therapeutically effective amount of a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salts or pharmaceutical compositions thereof, thereby activating the TLR receptor. In certain embodiments of such methods, the methods include administering the compound to a cell or tissue system or to a human or animal subject.

Another aspect provided herein are methods for treating a disease or disorder associated with TLR7 activity, wherein the method includes administering to a system or subject in need of such treatment an effective amount of a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salts thereof, thereby treating the disease or disorder. In certain embodiments of such methods, the methods include administering the compound to a cell or tissue system or to a human or animal subject. In certain embodiments of such methods, the disease or condition is an infectious disease, a viral infectious disease, an inflammatory disease, a respiratory disease, a dermatological disease, an autoimmune disease, a cell-proliferative disease or cancer. In certain embodiments of such methods, the disease or condition is asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDS), ulcerative colitis, Crohn's disease, bronchitis, dermatitis, actinic keratosis, basal cell carcinoma, bladder cancer, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, breast cancer, HIV, hepatitis, hepatitis C or lupus. In certain embodiments of such methods the disease is hepatitis B, hepatitis C, colorectal cancer or hepatocellular carcinoma.

Another aspect provided herein are methods for treating a cell-proliferative disease, comprising administering to a system or subject in need of such treatment an effective amount of a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salts thereof; wherein the cell-proliferative disease is bladder cancer, lymphoma, osteosarcoma, melanoma, or a tumor of breast, renal, prostate, colorectal, thyroid, ovarian, pancreatic, neuronal, lung, uterine or gastrointestinal tumor. In certain embodiments of such methods the cell proliferative disease is colorectal cancer or hepatocellular carcinoma. In certain embodiments of such methods the cell proliferative disease is colorectal cancer. In certain embodiments of such methods the cell proliferative disease is hepatocellular carcinoma.

Another aspect provided herein are compounds for use in a method of medical treatment, wherein the method of medical treatment is for treating a disease associated with TLR7 receptor activity, wherein the disease is selected from an infectious disease, a viral infectious disease, an inflammatory disease, a respiratory disease, a dermatological disease, an autoimmune disease, a cell-proliferative disease or cancer, and wherein the compound is a compound of Formula (I), Formula (Ia) or Formula (Ib). In certain embodiments of such methods, the disease or condition is asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDS), ulcerative colitis, Crohn's disease, bronchitis, dermatitis, actinic keratosis, basal cell carcinoma, bladder cancer, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, breast cancer, HIV, hepatitis, hepatitis C or lupus. In certain embodiments of such methods the disease is hepatitis B, hepatitis C, colorectal cancer or hepatocellular carcinoma.

DETAILED DESCRIPTION OF THE INVENTION

Definitions

The term “alkyl,” as used herein, refers to a saturated branched or straight chain hydrocarbon. In certain embodiments such alkyl groups are optionally substituted. As used herein, the terms “C₁-C₃alkyl”, “C₁-C₄alkyl”, “C₁-C₅alkyl”, “C₁-C₆alkyl”, “C₁-C₇alkyl” and “C₁-C₈alkyl” refer to an alkyl group containing at least 1, and at most 3, 4, 5, 6, 7 or 8 carbon atoms, respectively. If not otherwise specified, an alkyl group generally is a C₁-C₆ alkyl. Non-limiting examples of alkyl groups as used herein include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, isopentyl, hexyl, heptyl, octyl, nonyl, decyl and the like.

The term “heteroatom,” as used herein, refers to nitrogen (N), oxygen (O) or sulfur (S) atoms.

The term “heterocycloalkyl,” as used herein refers to a to saturated 3-6 membered monocyclic hydrocarbon ring structure, a to saturated 5-6 membered monocyclic hydrocarbon ring structure, a saturated 6-9 membered fused bicyclic hydrocarbon ring structure, or a saturated 10-14 membered fused tricyclic hydrocarbon ring structure, wherein one to four of the ring carbons of the hydrocarbon ring structure are replaced by one to four groups independently selected from —O—, —NR—, or —S—, wherein R is hydrogen, C₁-C₄alkyl or an amino protecting group.

Non-limiting examples of heterocycloalkyl groups, as used herein, include aziridinyl, aziridin-1-yl, aziridin-2-yl, aziridin-3-yl, oxiranyl, oxiran-2-yl, oxiran-3-yl, thiiranyl, thiiran-2-yl, thiiran-3-yl, azetadinyl, azetadin-1-yl, azetadin-2-yl, azetadin-3-yl, oxetanyl, oxetan-2-yl, oxetan-3-yl, oxetan-4-yl, thietanyl, thietan-2-yl, thietan-3-yl, thietan-4-yl, pyrrolidinyl, pyrrolidin-1-yl, pyrrolidin-2-yl, pyrrolidin-3-yl, pyrrolidin-4-yl, pyrrolidin-5-yl, tetrahydrofuranyl, tetrahydrofuran-2-yl, tetrahydrofuran-3-yl, tetrahydrofuran-4-yl, tetrahydrofuran-5-yl, tetrahydrothienyl, tetrahydrothien-2-yl, tetrahydrothien-3-yl, tetrahydrothien-4-yl, tetrahydrothien-5-yl, piperidinyl, piperidin-1-yl, piperidin-2-yl, piperidin-3-yl, piperidin-4-yl, piperidin-5-yl, piperidin-6-yl, tetrahydropyranyl, tetrahydropyran-2-yl, tetrahydropyran-3-yl, tetrahydropyran-4-yl, tetrahydropyran-5-yl, tetrahydropyran-6-yl, tetrahydrothiopyranyl, tetrahydrothiopyran-2-yl, tetrahydrothiopyran-3-yl, tetrahydrothiopyran-4-yl, tetrahydrothiopyran-5-yl, tetrahydrothiopyran-6-yl, piperazinyl, piperazin-1-yl, piperazin-2-yl, piperazin-3-yl, piperazin-4-yl, piperazin-5-yl, piperazin-6-yl, morpholinyl, morpholin-2-yl, morpholin-3-yl, morpholin-4-yl, morpholin-5-yl, morpholin-6-yl, thiomorpholinyl, thiomorpholin-2-yl, thiomorpholin-3-yl, thiomorpholin-4-yl, thiomorpholin-5-yl, thiomorpholin-6-yl, oxathianyl, oxathian-2-yl, oxathian-3-yl, oxathian-5-yl, oxathian-6-yl, dithianyl, dithian-2-yl, dithian-3-yl, dithian-5-yl, dithian-6-yl, azepanyl, azepan-1-yl, azepan-2-yl, azepan-3-yl, azepan-4-yl, azepan-5-yl, azepan-6-yl, azepan-7-yl, oxepanyl, oxepan-2-yl, oxepan-3-yl, oxepan-4-yl, oxepan-5-yl, oxepan-6-yl, oxepan-7-yl, thiepanyl, thiepan-2-yl, thiepan-3-yl, thiepan-4-yl, thiepan-5-yl, thiepan-6-yl, thiepan-7-yl, dioxolanyl, dioxolan-2-yl, dioxolan-4-yl, dioxolan-5-yl, thioxanyl, thioxan-2-yl, thioxan-3-yl, thioxan-4-yl, thioxan-5-yl, dithiolanyl, dithiolan-2-yl, dithiolan-4-yl, dithiolan-5-yl, pyrrolinyl, pyrrolin-1-yl, pyrrolin-2-yl, pyrrolin-3-yl, pyrrolin-4-yl, pyrrolin-5-yl, imidazolinyl, imidazolin-1-yl, imidazolin-3-yl, imidazolin-4-yl, imidazolin-5-yl, imidazolidinyl, imidazolidin-1-yl, imidazolidin-2-yl, imidazolidin-3-yl, imidazolidin-4-yl, imidazolidin-4-yl, pyrazolinyl, pyrazolin-1-yl, pyrazolin-3-yl, pyrazolin-4-yl, pyrazolin-5-yl, pyrazolidinyl, pyrazolidin-1-yl, pyrazolidin-2-yl, pyrazolidin-3-yl, pyrazolidin-4-yl, pyrazolidin-5-yl, hexahydro-1,4-diazepinyl, dihydrofuranyldihydropyranyl, 1,2,3,6-tetrahydropyridinyl, 2H-pyranyl, 4H-pyranyl, dihydropyranyl, dihydrothienyl, dihydrofuranyl, 3-azabicyclo[3.1.0]hexanyl, 3-azabicyclo[4.1.0]heptanyl, pyrrolidinyl-2-one, piperidinyl-3-one piperidinyl-2-one, piperidinyl-4-one, and 2H-pyrrolyl

The term “acceptable” with respect to a formulation, composition or ingredient, as used herein, means having no persistent detrimental effect on the general health of the subject being treated.

The term “administration” or “administering” of the subject compound means providing a compound of Formula (I) or a pharmaceutically acceptable salt thereof to a subject in need of treatment.

The term “cancer,” as used herein refers to an abnormal growth of cells which tend to proliferate in an uncontrolled way and, in some cases, to metastasize (spread). The types of cancer include, but is not limited to, solid tumors (such as those of the bladder, bowel, brain, breast, endometrium, heart, kidney, lung, lymphatic tissue (lymphoma), ovary, pancreas or other endocrine organ (thyroid), prostate, skin (melanoma) or hematological tumors (such as the leukemias).

The term “carrier,” as used herein, refers to chemical compounds or agents that facilitate the incorporation of a compound described herein into cells or tissues.

The terms “co-administration” or “combined administration” or the like as used herein are meant to encompass administration of the selected therapeutic agents to a single patient, and are intended to include treatment regimens in which the agents are not necessarily administered by the same route of administration or at the same time.

The term “dermatological disorder,” as used herein refers to a skin disorder. Such dermatological disorders include, but are not limited to, proliferative or inflammatory disorders of the skin such as, atopic dermatitis, bullous disorders, collagenoses, contact dermatitis eczema, Kawasaki Disease, rosacea, Sjogren-Larsso Syndrome, actinic keratosis, basal cell carcinoma and urticaria.

The term “diluent,” as used herein, refers to chemical compounds that are used to dilute a compound described herein prior to delivery. Diluents can also be used to stabilize compounds described herein.

The terms “effective amount” or “therapeutically effective amount,” as used herein, refer to a sufficient amount of a compound described herein being administered which will relieve to some extent one or more of the symptoms of the disease or condition being treated. The result can be reduction and/or alleviation of the signs, symptoms, or causes of a disease, or any other desired alteration of a biological system. For example, an “effective amount” for therapeutic uses is the amount of the composition comprising a compound as disclosed herein required to provide a clinically significant decrease in disease symptoms. An appropriate “effective” amount in any individual case may be determined using techniques, such as a dose escalation study.

The terms “enhance” or “enhancing,” as used herein, means to increase or prolong either in potency or duration a desired effect. Thus, in regard to enhancing the effect of therapeutic agents, the term “enhancing” refers to the ability to increase or prolong, either in potency or duration, the effect of other therapeutic agents on a system. An “enhancing-effective amount,” as used herein, refers to an amount adequate to enhance the effect of another therapeutic agent in a desired system.

The term “excipient” refers to any essentially accessory substance that may be present in the finished dosage form. For example, the term “excipient” includes vehicles, binders, disontegrants, fillers (diluents), lubricants, suspending/dispersing agents, and the like.

The terms “fibrosis” or “fibrosing disorder,” as used herein, refers to conditions that follow acute or chronic inflammation and are associated with the abnormal accumulation of cells and/or collagen and include but are not limited to fibrosis of individual organs or tissues such as the heart, kidney, joints, lung, or skin, and includes such disorders as idiopathic pulmonary fibrosis and cryptogenic fibrosing alveolitis.

The term “iatrogenic,” as used herein, means a condition, disorder, or disease created or worsened by medical or surgical therapy.

The term “immunologically effective amount,” as used herein, means that the administration of a sufficient amount to an individual, either in a single dose or as part of a series, that is effective for treatment or prevention of an immunological disease or disorder. This amount varies depending upon the health and physical condition of the individual to be treated, age, the taxonomic group of individual to be treated (e.g. non-human primate, primate, etc.), the capacity of the individual's immune system to synthesize antibodies, the degree of protection desired, the treating doctor's assessment of the medical situation, and other relevant factors. It is expected that the amount will fall in a relatively broad range that can be determined through routine trials.

An “immunological response” or “immune response” to an antigen or composition, as used herein, refers to the development in a subject of a humoral and/or cellular immune response to the antigen or composition.

Immune responses include innate and adaptive immune responses. Innate immune responses are fast-acting responses that provide a first line of defense for the immune system. In contrast, adaptive immunity uses selection and clonal expansion of immune cells having somatically rearranged receptor genes (e.g., T- and B-cell receptors) that recognize antigens from a given pathogen or disorder (e.g., a tumor), thereby providing specificity and immunological memory. Innate immune responses, among their many effects, lead to a rapid burst of inflammatory cytokines and activation of antigen-presenting cells (APCs) such as macrophages and dendritic cells. To distinguish pathogens from self-components, the innate immune system uses a variety of relatively invariable receptors that detect signatures from pathogens, known as pathogen-associated molecular patterns, or PAMPs. The mechanism behind this potentiation of the immune responses has been reported to involve pattern-recognition receptors (PRRs), which are differentially expressed on a variety of immune cells, including neutrophils, macrophages, dendritic cells, natural killer cells, B cells and some nonimmune cells such as epithelial and endothelial cells. Engagement of PRRs leads to the activation of some of these cells and their secretion of cytokines and chemokines, as well as maturation and migration of other cells. In tandem, this creates an inflammatory environment that leads to the establishment of the adaptive immune response. PRRs include nonphagocytic receptors, such as Toll-like receptors (TLRs) and nucleotide-binding oligomerization domain (NOD) proteins, and receptors that induce phagocytosis, such as scavenger receptors, mannose receptors and β-glucan receptors. Dendritic cells are recognized as some of the most important cell types for initiating the priming of naive CD4⁺ helper T (T_(H)) cells and for inducing CD8⁺ T cell differentiation into killer cells. TLR signaling has been reported to play an important role in determining the quality of these helper T cell responses, for instance, with the nature of the TLR signal determining the specific type of T_(H) response that is observed (e.g., T_(H)1 versus T_(H)2 response). A combination of antibody (humoral) and cellular immunity are produced as part of a T_(H)i-type response, whereas a T_(H)2-type response is predominantly an antibody response.

A “humoral immune response” refers to an immune response mediated by antibody molecules, while a “cellular immune response” refers to an immune response mediated by T-lymphocytes and/or other white blood cells. One important aspect of cellular immunity involves an antigen-specific response by cytolytic T-cells (“CTLs”). CTLs have specificity for peptide antigens that are presented in association with proteins encoded by the major histocompatibility complex (MHC) and expressed on the surfaces of cells. CTLs help induce and promote the intracellular destruction of intracellular microbes, or the lysis of cells infected with such microbes. Another aspect of cellular immunity involves an antigen-specific response by helper T-cells. Helper T-cells act to help stimulate the function, and focus the activity of, nonspecific effector cells against cells displaying peptide antigens in association with MHC molecules on their surface. A “cellular immune response” also refers to the production of cytokines, chemokines and other such molecules produced by activated T-cells and/or other white blood cells, including those derived from CD4+ and CD8+ T-cells.

The term “inflammatory disorders,” as used herein, refers to those diseases or conditions that are characterized by one or more of the signs of pain (dolor, from the generation of noxious substances and the stimulation of nerves), heat (calor, from vasodilatation), redness (rubor, from vasodilatation and increased blood flow), swelling (tumor, from excessive inflow or restricted outflow of fluid), and loss of function (functio laesa, which may be partial or complete, temporary or permanent). Inflammation takes many forms and includes, but is not limited to, inflammation that is one or more of the following: acute, adhesive, atrophic, catarrhal, chronic, cirrhotic, diffuse, disseminated, exudative, fibrinous, fibrosing, focal, granulomatous, hyperplastic, hypertrophic, interstitial, metastatic, necrotic, obliterative, parenchymatous, plastic, productive, proliferous, pseudomembranous, purulent, sclerosing, seroplastic, serous, simple, specific, subacute, suppurative, toxic, traumatic, and/or ulcerative. Inflammatory disorders further include, without being limited to those affecting the blood vessels (polyarteritis, temporal arthritis); joints (arthritis: crystalline, osteo-, psoriatic, reactive, rheumatoid, Reiter's); gastrointestinal tract (Disease); skin (dermatitis); or multiple organs and tissues (systemic lupus erythematosus).

The terms “ocular disease” or “ophthalmic disease,” as used herein, refer to diseases which affect the eye or eyes and potentially the surrounding tissues as well. Ocular or ophthalmic diseases include, but are not limited to, conjunctivitis, retinitis, scleritis, uveitis, allergic conjuctivitis, vernal conjunctivitis, papillary conjunctivitis and cytomegalovirus (CMV) retinitis.

The term “pharmaceutically acceptable,” as used herein, refers a material, such as a carrier or diluent, which does not abrogate the biological activity or properties of the compounds described herein. Such materials are administered to an individual without causing undesirable biological effects or interacting in a deleterious manner with any of the components of the composition in which it is contained.

The term “pharmaceutically acceptable salt,” as used herein, refers to a formulation of a compound that does not cause significant irritation to an organism to which it is administered and does not abrogate the biological activity and properties of the compounds described herein.

The terms “combination” or “pharmaceutical combination,” as used herein mean a product that results from the mixing or combining of more than one active ingredient and includes both fixed and non-fixed combinations of the active ingredients. The term “fixed combination” means that the active ingredients, by way of example, a compound of Formula (I) and an additional therapeutic agent, are both administered to a patient simultaneously in the form of a single entity or dosage. The term “non-fixed combination” means that the active ingredients, by way of example, a compound of Formula (I) and an additional therapeutic agent, are both administered to a patient as separate entities either simultaneously, concurrently or sequentially with no specific time limits, wherein such administration provides therapeutically effective levels of the 2 compounds in the body of the patient. The latter also applies to cocktail therapy, e.g. the administration of 3 or more active ingredients.

The terms “composition” or “pharmaceutical composition,” as used herein, refers to a mixture a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, with at least one and optionally more than one other pharmaceutically acceptable chemical components, such as carriers, stabilizers, diluents, dispersing agents, suspending agents, thickening agents, and/or excipients.

The term “respiratory disease,” as used herein, refers to diseases affecting the organs that are involved in breathing, such as the nose, throat, larynx, trachea, bronchi, and lungs. Respiratory diseases include, but are not limited to, asthma, adult respiratory distress syndrome and allergic (extrinsic) asthma, non-allergic (intrinsic) asthma, acute severe asthma, chronic asthma, clinical asthma, nocturnal asthma, allergen-induced asthma, aspirin-sensitive asthma, exercise-induced asthma, isocapnic hyperventilation, child-onset asthma, adult-onset asthma, cough-variant asthma, occupational asthma, steroid-resistant asthma, seasonal asthma, seasonal allergic rhinitis, perennial allergic rhinitis, chronic obstructive pulmonary disease, including chronic bronchitis or emphysema, pulmonary hypertension, interstitial lung fibrosis and/or airway inflammation and cystic fibrosis, and hypoxia.

The term “subject” or “patient,” as used herein, encompasses mammals and non-mammals. Examples of mammals include, but are not limited to, humans, chimpanzees, apes monkeys, cattle, horses, sheep, goats, swine; rabbits, dogs, cats, rats, mice, guinea pigs, and the like. Examples of non-mammals include, but are not limited to, birds, fish and the like. Frequently the subject is a human, and may be a human who has been diagnosed as in need of treatment for a disease or disorder disclosed herein.

The term “TLR7 agonist,” as used herein, refers to a compound which activates a TLR7 receptor.

The term “TLR7 disease” or a “disease or disorder associated with TLR7 activity,” as used herein, refers to any disease state associated with a toll-like receptor. Such diseases or disorders include, but are not limited to, an infectious disease, a viral infectious disease, an inflammatory disease, a respiratory disease, a dermatological disease, an autoimmune disease, a cell-proliferative disease and cancer, such as, by way of example only, asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDS), ulcerative colitis, Crohn's disease, bronchitis, dermatitis, actinic keratosis, basal cell carcinoma, bladder cancer, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, breast cancer, lymphoma, osteosarcoma, melanoma, breast cancer, renal cancer, prostate cancer, colorectal cancer, thyroid cancer, ovarian cancer, pancreatic cancer, neuronal cancer, lung, uterine cancer gastrointestinal cancer, HIV, hepatitis, hepatitis B, hepatitis C, hepatocellular carcinoma or lupus.

The term “therapeutically effective amount,” as used herein, refers to any amount of a compound which, as compared to a corresponding subject who has not received such amount, results in improved treatment, healing, prevention, or amelioration of a disease, disorder, or side effect, or a decrease in the rate of advancement of a disease or disorder. The term also includes within its scope amounts effective to enhance normal physiological function.

The terms “treat,” “treating” or “treatment,” as used herein, refers to methods of alleviating, abating or ameliorating a disease or condition symptoms, preventing additional symptoms, ameliorating or preventing the underlying metabolic causes of symptoms, inhibiting the disease or condition, arresting the development of the disease or condition, relieving the disease or condition, causing regression of the disease or condition, relieving a condition caused by the disease or condition, or stopping the symptoms of the disease or condition either prophylactically and/or therapeutically.

The compound names were obtained using ChemDraw Ultra 10.0 (CambridgeSoft®) or JChem version 5.2.2 (ChemAxon).

Description of the Preferred Embodiments

Provided herein are compounds and pharmaceutical compositions thereof, which are agonists of toll-like receptor-7 (TLR7). Also are compounds, pharmaceutical compositions and methods for the treatment of diseases and/or disorders associated with TLR7 activity.

The TLR7 agonists of the invention are compounds having the structure of Formula (I), and pharmaceutically acceptable salts, individual isomers and mixture of isomers thereof:

wherein:

-   R¹ is —NHR⁶ or —NHCHR⁶R⁹; -   R³ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷),     —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,     -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl; -   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷),     —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,     -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl;     -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl;         -   or when R⁴ is H, then R³ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,             —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH,             —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH             or tetrazolyl; -   L₁ is —(CH₂)_(m)—; -   L₂ is —(CH₂)_(m)—; -   L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—; -   R⁶ is —C₃-C₆alkyl; -   R⁷ is —C₁-C₃alkyl; -   R⁹ is L₁OH; -   each R¹¹ is independently selected from —OH; -   R¹² is     -   a) an unsubstituted tetrazolyl;     -   b) a tetrazolyl substituted with -L₁C(═O)OH;     -   or     -   c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms         independently selected from N and O substituted with —C(═O)OH; -   each m is independently selected from 1, 2, 3, and 4, -   and -   each n is independently selected from 0, 1, 2, 3, and 4.

In certain embodiments, the TLR7 agonists of the invention are compounds having the structure of Formula (Ia) or Formula (Ib):

where R¹, R³ and R⁴ are as defined herein.

The compounds of Formula (I), Formula (Ia) and Formula (Ib) provided herein, and the pharmaceutically acceptable salts thereof, also includes all suitable isotopic variations of such compounds, and pharmaceutically acceptable salts. An isotopic variation of a compound or a pharmaceutically acceptable salt thereof is defined as one in which at least one atom is replaced by an atom having the same atomic number but an atomic mass different from the atomic mass usually found in nature. Examples of isotopes that may be incorporated into the compounds and pharmaceutically acceptable salts thereof include but are not limited to isotopes of hydrogen, carbon, nitrogen and oxygen such as ²H, ³H, ¹¹C, ¹³C, ¹⁴C ¹⁵N, ¹⁷O, ¹⁸O, ³⁵S, ¹⁸F, ³⁶Cl and ¹²³I. Certain isotopic variations of the compounds and pharmaceutically acceptable salts thereof, for example, those in which a radioactive isotope such as ³H or ¹⁴C is incorporated, are useful in drug and/or substrate tissue distribution studies. In particular examples, ³H and ¹⁴C isotopes may be used for their ease of preparation and detectability. In other examples, substitution with isotopes such as ²H may afford certain therapeutic advantages resulting from greater metabolic stability, such as increased in vivo half-life or reduced dosage requirements. Isotopic variations of the compounds, and pharmaceutically acceptable salts

and isomers thereof, are prepared by conventional procedures using appropriate isotopic variations of suitable reagents.

Processes for Making Compounds of Formula (I)

General procedures for preparing compounds of Formula (I), and subformulae thereof, are described in the Examples, infra. In the reactions described, reactive functional groups, for example hydroxy, amino, imino, thio or carboxy groups, where these are desired in the final product, may be protected to avoid their unwanted participation in the reactions. Conventional protecting groups may be used in accordance with standard practice (see e.g., T.W. Greene and P. G. M. Wuts in “Protective Groups in Organic Chemistry,” John Wiley and Sons, 1991).

In certain embodiments, the compounds of Formula (I), and subformulae thereof, are prepared as a pharmaceutically acceptable acid addition salt by reacting the free base form of the compound of Formula (I), Formula (Ia) or Formula (Ib) with a pharmaceutically acceptable organic acid or inorganic acid. In other embodiments, a pharmaceutically acceptable base addition salt of compounds of Formula (I), Formula (Ia) or Formula (Ib) is prepared by reacting the free acid form of the compound of Formula (I), Formula (Ia) or Formula (Ib) with a pharmaceutically acceptable organic base or inorganic base. Alternatively, the salt forms of the compounds of Formula (I), Formula (Ia) or Formula (Ib) are prepared using salts of the starting materials or intermediates. In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib) are in the form of other salts including, but not limited to, oxalates and trifluoroacetates. In certain embodiments, hemisalts of acids and bases are formed, for example, hemisulphate and hemicalcium salts.

Such pharmaceutically acceptable acid addition salts of compounds of Formula (I), Formula (Ia) or Formula (Ib) include, but are not limited to, a hydrobromide, hydrochloride, sulfate, nitrate, succinate, maleate, formate, acetate, adipate, besylatye, bicarbonate/carbonate, propionate, fumarate, citrate, tartrate, lactate, benzoate, salicylate, glutamate, aspartate, p-toluenesulfonate, benzenesulfonate, methanesulfonate, ethanesulfonate, naphthalenesulfonate (e.g. 2-naphthalenesulfonate), hexanoate salt, bisulphate/sulphate, borate, camsylate, cyclamate, edisylate, esylate, gluceptate, gluconate, glucuronate, hexafluorophosphate, hibenzate, hydrochloride/chloride, hydrobromide/bromide, hydroiodide/iodide, isethionate, lactate, malate, malonate, mesylate, methylsulphate, naphthylate, 2-napsylate, nicotinate, orotate, oxalate, palmitate, pamoate, phosphate/hydrogen phosphate/dihydrogen phosphate, pyroglutamate, saccharate, stearate, tannate, tosylate, trifluoroacetate and xinofoate salts.

The organic acid or inorganic acids used to form certain pharmaceutically acceptable acid addition salts of compounds of Formula (I), Formula (Ia) or Formula (Ib) include, but are not limited to, hydrobromic, hydrochloric, sulfuric, nitric, phosphoric, succinic, maleic, formic, acetic, propionic, fumaric, citric, tartaric, lactic, benzoic, salicylic, glutamic, aspartic, p-toluenesulfonic, benzenesulfonic, methanesulfonic, ethanesulfonic, naphthalenesulfonic such as 2-naphthalenesulfonic, or hexanoic acid.

Such pharmaceutically acceptable base addition salt of a compound of Formula (I), Formula (Ia) or Formula (Ib) include, but are not limited to, aluminium, arginine, benzathine, calcium, choline, diethylamine, diolamine, glycine, lysine, magnesium, meglumine, olamine, potassium, sodium, tromethamine and zinc salts.

In certain embodiments, the free acid or free base forms of the compounds of Formula (I) are prepared from the corresponding base addition salt or acid addition salt from, respectively. For example a compound Formula (I), Formula (Ia) or Formula (Ib) in an acid addition salt form is converted to the corresponding free base by treating with a suitable base (by way of example only, an ammonium hydroxide solution, a sodium hydroxide, and the like). For example, a compound of Formula (I), Formula (Ia) or Formula (Ib) in a base addition salt form is converted to the corresponding free acid by treating with a suitable acid (by way of example only, hydrochloric acid).

In certain embodiments, compounds of Formula (I), Formula (Ia) or Formula (Ib) are prepared as protected derivatives using methods known to those of ordinary skill in the art. A detailed description of the techniques applicable to the creation of protecting groups and their removal can be found in T. W. Greene, “Protecting Groups in Organic Chemistry,” 3^(rd) edition, John Wiley and Sons, Inc., 1999.

In certain embodiments, compounds of Formula (I), Formula (Ia) and Formula (Ib) are prepared as their individual stereoisomers. In other embodiments, the compounds of Formula (I), Formula (Ia) and Formula (Ib) are prepared as their individual stereoisomers by reacting a racemic mixture of the compound with an optically active resolving agent to form a pair of diastereoisomeric compounds, separating the diastereomers and recovering the optically pure enantiomers. In certain embodiments, resolution of enantiomers is carried out using covalent diastereomeric derivatives of the compounds of Formula (I), Formula (Ia) or Formula (Ib), or by using dissociable complexes (e.g., crystalline diastereomeric salts). Diastereomers have distinct physical properties (e.g., melting points, boiling points, solubility, reactivity, etc.) and are readily separated by taking advantage of these dissimilarities. In certain embodiments, the diastereomers are separated by chromatography, or by separation/resolution techniques based upon differences in solubility. The optically pure enantiomer is then recovered, along with the resolving agent, by any practical means that would not result in racemization. A more detailed description of the techniques applicable to the resolution of stereoisomers of compounds from their racemic mixture can be found in Jean Jacques, Andre Collet, Samuel H. Wilen, “Enantiomers, Racemates and Resolutions,” John Wiley And Sons, Inc., 1981.

A non-limiting example of a synthetic scheme used to make compounds of Formula (I) is illustrated in reaction scheme (I) below.

Scheme (I) illustrates the synthesis of pyrrolopyrimidines of Formula (I) using a two-step scheme starting with commercially available 4-chloro-5H-pyrrolo[3,2-d]pyrimidin-2-amine. Alkylation at the N-5 position by a benzylbromide (or benzylchloride) analog gives the corresponding 5-benzyl derivatives, where R³ and R⁴ are as defined herein. Subsequent S_(N)Ar substitution of the chloro group by an alkyl amine derivative affords the corresponding 4,5-disubstituted pyrrolopyrimidine, where R is R⁶ or —CHR⁶R⁹ and R⁶ and R⁹ are as defined herein.

Pharmacology and Utility

When a foreign antigen challenges the immune system it responds by launching a protective response that is characterized by the coordinated interaction of both the innate and acquired immune systems. These two interdependent systems fulfill two mutually exclusive requirements: speed (contributed by the innate system) and specificity (contributed by the adaptive system).

The innate immune system serves as the first line of defense against invading pathogens, holding the pathogen in check while the adaptive responses are matured. It is triggered within minutes of infection in an antigen-independent fashion, responding to broadly conserved patterns in the pathogens (though it is not non-specific, and can distinguish between self and pathogens). Crucially, it also generates the inflammatory and co-stimulatory milieu (sometimes referred to as the danger signal) that potentiates the adaptive immune system and steers (or polarizes it) towards the cellular or humoral responses most appropriate for combating the infectious agent. The development of TLR modulators for therapeutic targeting of innate immunity has been reviewed (see Nature Medicine, 2007, 13, 552-559; Drug Discovery Today: Therapeutic Stategies, 2006, 3, 343-352 and Journal of Immunology, 2005, 174, 1259-1268).

The adaptive response becomes effective over days or weeks, but ultimately provides the fine antigenic specificity required for complete elimination of the pathogen and the generation of immunologic memory. It is mediated principally by T and B cells that have undergone germline gene rearrangement and are characterized by specificity and long-lasting memory. However, it also involves the recruitment of elements of the innate immune system, including professional phagocytes (macrophages, neutrophils etc.) and granulocytes (basophils, eosinophils etc.) that engulf bacteria and even relatively large protozoal parasites. Once an adaptive immune response has matured, subsequent exposure to the pathogen results in its rapid elimination due to highly specific memory cells have been generated that are rapidly activated upon subsequent exposure to their cognate antigen.

Autoimmune diseases, are defined by (i) humoral or autoantibody response to a self antigen (by way of example only, Graves' primary hyperthyroidism with antibodies to the TSH receptor), or (ii) cellular response wherein immune cells destroy nonimmune cells from which the self-antigen is derived (by way of example only, the thyrocyte (Hashimoto's thyroiditis) or pancreatic □-islet cell (Type 1 diabetes). Many autoimmune diseases are a combination of both phenomena, for instance, Hashimoto's and Type 1 diabetes also have auto-antibodies, anti-thyroid peroxidase (TPO) or anti-glutamic acid decarboxylase (GAD)/Islet Cell. Autoimmune diseases often have an inflammatory component including, but not limited to, increases in adhesion molecules (by way of example only, vascular cell adhesion molecule-1 (VCAM-1), and altered leukocyte adhesion to the vasculature such as, by way of example only, colitis, systemic lupus, systemic sclerosis, and the vascular complications of diabetes.

Toll-like receptors (TLRs) are type-I transmembrane proteins characterized by an extracellular N-terminal leucine-rich repeat (LRR) domain, followed by a cysteine-rich region, a TM domain, and an intracellular (cytoplasmic) tail that contains a conserved region named the Toll/IL-1 receptor (TIR) domain. TLRs are pattern recognition receptors (PRR) that are expressed predominantly on immune cells including, but not limited to, dendritic cells, T lymphocytes, macrophages, monocytes and natural killer cells. The LLR domain is important for ligand binding and associated signaling and is a common feature of PRRs. The TIR domain is important in protein-protein interactions and is associated with innate immunity. The TIR domain also unites a larger IL-1 R/TLR superfamily that is composed of three subgroups. Members of the first group possess immunoglobin domains in their extracellular regions and include IL-1 and IL-18 receptors and accessory proteins as well as ST2. The second group encompasses the TLRs. The third group includes intracellular adaptor proteins important for signaling.

TLRs are a group of pattern recognition receptors which bind to pathogen-associated molecular patterns (PAMPS) from bacteria, fungi, protozoa and viruses, and act as a first line of defense against invading pathogens. TLRs are essential to induce expression of genes involved in inflammatory responses, and TLRs and the innate immune system are a critical step in the development of antigen-specific acquired immunity.

Adaptive (humoral or cell-mediated) immunity is associated with the TLR signal mechanism of innate immunity. Innate immunity is a protective immune cell response that functions rapidly to fight environmental insults including, but not limited to, bacterial or viral agents. Adaptive immunity is a slower response, which involves differentiation and activation of naive T lymphocytes into T helper 1 (Th1) or T helper 2 (Th2) cell types. Th1 cells mainly promote cellular immunity, whereas Th2 cells mainly promote humoral immunity. Though primarily a host protective system, pathologic expression of the innate immunity signals emanating from the TLR pathway are implicated in initiating autoimmune-inflammatory diseases.

All TLRs appear to function as either a homodimer or heterodimer in the recognition of a specific, or set of specific, molecular determinants present on pathogenic organisms including bacterial cell-surface lipopolysaccharides, lipoproteins, bacterial flagellin, DNA from both bacteria and viruses and viral RNA. The cellular response to TLR activation involves activation of one or more transcription factors, leading to the production and secretion of cytokines and co-stimulatory molecules such as interferons, TNF-, interleukins, MIP-1 and MCP-1 which contribute to the killing and clearance of the pathogenic invasion.

TLR spatial expression is coincident with the host's environmental interface. While only a few other Toll-like proteins have been cloned in Drosophila, the human TLR family is composed of at least 11 members, TLR1 through TLR11, that elicit overlapping yet distinct biological responses due to differences in cellular expression and signaling pathways they initiate. Each of the TLRs is expressed on a different subset of leukocytes and each of the TLRs is specific in its expression patterns and PAMP sensitivities and detects different subsets of pathogens allowing vigilant surveillance by the immune system.

Toll-like Receptor 7 (TLR7)

TLR7 maps to human chromosome Xp22, and the TLR7 sequence encodes a 1049 (aa) protein containing 27 N-terminal LRRs with a calculated molecular weight of 121 kDa. TLR7 is most closely related to TLR8 and TLR9 with 43% and 36% overall (aa) sequence identity, respectively.

In vivo, TLR7 mRNA is expressed in lung, placenta, spleen, lymph node, and tonsil. TLR7 mRNA expression is highest in monocytes, B cells, and plasmocytoid dendritic cells. In vitro, TLR7 mRNA expression is upregulated in THP-1 cells upon PMA-induced differentiation. TLR7 is highly upregulated by exposure to IL-6 and to a slightly lesser extent by autocrine IFN-γ, IL-1β. TLR7 mRNA expression in THP-1 cells is elevated after exposure to both Gram-positive and Gram-negative bacteria. Ex vivo, expression of TLR7 is elevated after exposure to both Gram-positive and Gram-negative bacteria in monocytes and to a greater degree in granulocytes. TLR7 is expressed in the endosome. The role of TLR7, is to detect the presence of “foreign” single-stranded RNA within a cell, as a means to respond to viral invasion. TLR7 is a structurally highly conserved protein which recognizes guanosine- or uridine-rich, single-stranded RNA (ssRNA) from viruses such as human immunodeficiency virus, vesicular stomatitis virus and influenza virus. Thus, through activation of dendritic cells and other antigen-presenting cells, TLR7 engagement and resulting cytokine production is expected to activate diverse innate and acquired immune response mechanisms leading to the destruction of pathogens, infected cells or tumor cells.

Compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, pharmaceutical compositions, and/or combinations are agonists of toll-like receptor 7 activity, and are used in the treatment of diseases and/or disorders associated with such TLR7 receptors.

In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, pharmaceutical compositions, and/or combinations are used in the treatment of respiratory diseases and/or disorders including, but not limited to, asthma, bronchial asthma, allergic asthma, intrinsic asthma, extrinsic asthma, exercise-induced asthma, drug-induced asthma (including aspirin and NSAID-induced) and dust-induced asthma, chronic obstructive pulmonary disease (COPD); bronchitis, including infectious and eosinophilic bronchitis; emphysema; bronchiectasis; cystic fibrosis; sarcoidosis; farmer's lung and related diseases; hypersensitivity pneumonitis; lung fibrosis, including cryptogenic fibrosing alveolitis, idiopathic interstitial pneumonias, fibrosis complicating anti-neoplastic therapy and chronic infection, including tuberculosis and aspergillosis and other fungal infections; complications of lung transplantation; vasculitic and thrombotic disorders of the lung vasculature, and pulmonary hypertension; antitussive activity including treatment of chronic cough associated with inflammatory and secretory conditions of the airways, and iatrogenic cough; acute and chronic rhinitis including rhinitis medicamentosa, and vasomotor rhinitis; perennial and seasonal allergic rhinitis including rhinitis nervosa (hay fever); nasal polyposis; acute viral infection including the common cold, and infection due to respiratory syncytial virus, influenza, coronavirus (including SARS) and adenovirus.

In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, pharmaceutical compositions, and/or combinations are used in the treatment of dermatological disorders including, but not limited to, psoriasis, atopic dermatitis, contact dermatitis or other eczematous dermatoses, and delayed-type hypersensitivity reactions; phyto- and photodermatitis; seborrhoeic dermatitis, dermatitis herpetiformis, lichen planus, lichen sclerosus et atrophica, pyoderma gangrenosum, skin sarcoid, basal cell carcinoma, actinic keratosis, discoid lupus erythematosus, pemphigus, pemphigoid, epidermolysis bullosa, urticaria, angioedema, vasculitides, toxic erythemas, cutaneous eosinophilias, alopecia areata, male-pattern baldness, Sweet's syndrome, Weber-Christian syndrome, erythema multiforme; cellulitis, both infective and non-infective; panniculitis; cutaneous lymphomas, non-melanoma skin cancer and other dysplastic lesions; drug-induced disorders including fixed drug eruptions.

In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, pharmaceutical compositions, and/or combinations are used in the treatment of ocular diseases and/or disorders including, but not limited to, blepharitis; conjunctivitis, including perennial and vernal allergic conjunctivitis; iritis; anterior and posterior uveitis; choroiditis; autoimmune, degenerative or inflammatory disorders affecting the retina; ophthalmitis including sympathetic ophthalmitis; sarcoidosis; infections including viral, fungal, and bacterial.

In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, pharmaceutical compositions, and/or combinations are used in the treatment of other auto-immune and allergic disorders including, but not limited to, rheumatoid arthritis, irritable bowel syndrome, systemic lupus erythematosus, multiple sclerosis, Hashimoto's thyroiditis, Crohn's disease, inflammatory bowel disease (IBD), Graves' disease, Addison's disease, diabetes mellitus, idiopathic thrombocytopaenic purpura, eosinophilic fasciitis, hyper-IgE syndrome, antiphospholipid syndrome and Sazary syndrome.

In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, and pharmaceutical compositions are used in the treatment of cancer including, but not limited to, bladder, prostate, breast, colorectal, liver, hepatocellular carcinoma, lung, ovarian, pancreatic, bowel and colon, stomach, skin and brain tumors and malignancies affecting the bone marrow (including the leukaemias) and lymphoproliferative systems, such as Hodgkin's and non-Hodgkin's lymphoma; including the prevention and treatment of metastatic disease and tumor recurrences, and paraneoplastic syndromes. In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, and pharmaceutical compositions are useful as modulators of toll-like receptor activity, and are used in the treatment of neoplasias including, but not limited to, basal cell carcinoma, squamous cell carcinoma, actinic keratosis, melanoma, carcinomas, sarcomas, leukemias, renal cell carcinoma, Kaposi's sarcoma, myelogeous leukemia, chronic lymphocytic leukemia and multiple myeloma.

In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, pharmaceutical compositions, and/or combinations are used in the treatment of infectious diseases including, but not limited to, viral infectious diseases such as genital warts, common warts, plantar warts, respiratory syncytial virus (RSV), hepatitis B, hepatitis C, Dengue virus, herpes simplex virus (by way of example only, HSV-I, HSV-II, CMV, or VZV), molluscum contagiosum, vaccinia, variola, lentivirus, human immunodeficiency virus (HIV), human papilloma virus (HPV), cytomegalovirus (CMV), varicella zoster virus (VZV), rhinovirus, enterovirus, adenovirus, coronavirus (e.g., SARS), influenza, para-influenza, mumps virus, measles virus, papovavirus, hepadnavirus, flavivirus, retrovirus, arenavirus (by way of example only, LCM, Junin virus, Machupo virus, Guanarito virus and Lassa Fever) and filovirus (by way of example only, ebola virus or marbug virus).

In certain embodiments, the compounds of Formula (I), Formula (Ia) or Formula (Ib), pharmaceutically acceptable salts and isomers thereof, pharmaceutical compositions, and/or combinations are used in the treatment of bacterial, fungal, and protozoal infections including, but not limited to, tuberculosis and mycobacterium avium, leprosy; pneumocystis carnii, cryptosporidiosis, histoplasmosis, toxoplasmosis, trypanosome infection, leishmaniasis, infections caused by bacteria of the genus Escherichia, Enterobacter, Salmonella, Staphylococcus, Klebsiella, Proteus, Pseudomonas, Streptococcus, and Chlamydia, and fungal infections such as candidiasis, aspergillosis, histoplasmosis, cryptococcal meningitis.

Administration and Pharmaceutical Compositions

For the therapeutic uses of compounds of Formula (I), Formula (Ia) and Formula (Ib), or pharmaceutically acceptable salts and isomers thereof, such compounds are administered in therapeutically effective amounts either alone or as part of a pharmaceutical composition. Accordingly, such pharmaceutical compositions, comprise a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, and one or more pharmaceutically acceptable carriers, diluents, or excipients. In addition, such compounds and compositions are administered singly or in combination with one or more additional therapeutic agents. The method of administration of such compounds and compositions include, but are not limited to, oral administration, rectal administration, parenteral, intravenous administration, intravitreal administration, intramuscular administration, inhalation, intranasal administration, topical administration, ophthalmic administration or otic administration.

The therapeutically effective amount will vary depending on, among others, the disease indicated, the severity of the disease, the age and relative health of the subject, the potency of the compound administered, the mode of administration and the treatment desired. In certain embodiments, the daily dosage of a compound of Formula (I), Formula (Ia) or Formula (Ib), satisfactory results are indicated to be obtained systemically at daily dosages of from about 0.03 to 2.5 mg/kg per body weight. In certain embodiments, the daily dosage of a compound of Formula (I), Formula (Ia) or Formula (Ib), administered by inhalation, is in the range from 0.05 micrograms per kilogram body weight (μg/kg) to 100 micrograms per kilogram body weight (μg/kg). In certain embodiments, the quantit of a compound of Formula (I), Formula (Ia) or Formula (Ib) per dose administered by inhalation, is in the range from 10 ng to 500 ng. In other embodiments, the daily dosage of a compound of Formula (I), Formula (Ia) or Formula (Ib), administered orally, is in the range from 0.01 micrograms per kilogram body weight (μg/kg) to 100 milligrams per kilogram body weight (mg/kg). An indicated daily dosage in the larger mammal, e.g. humans, is in the range from about 0.5 mg to about 100 mg of a compound of Formula (I), conveniently administered, e.g. in divided doses up to four times a day or in controlled release form. In certain embodiment, unit dosage forms for oral administration comprise from about 1 to 50 mg of a compound of Formula (I), Formula (Ia) or Formula (Ib).

Other aspects provided herein are processes for the preparation of pharmaceutical composition which comprise a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof. In certain embodiments, such processes include admixing a compound of the Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salts thereof, with one or more pharmaceutically acceptable carriers, diluents or excipients. In certain embodiments, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), in free form or in a pharmaceutically acceptable salt form, in association with at least one pharmaceutically acceptable carrier, diluent or excipient are manufactured by mixing, granulating and/or coating methods. In other embodiments, such compositions are optionally contain excipients, such as preserving, stabilizing, wetting or emulsifying agents, solution promoters, salts for regulating the osmotic pressure and/or buffers. In other embodiments, such compositions are sterilized.

Oral Dosage Forms

In certain embodiments, the pharmaceutical compositions containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are administered orally as discrete dosage forms, wherein such dosage forms include, but are not limited to, capsules, gelatin capsules, caplets, tablets, chewable tablets, powders, granules, syrups, flavored syrups, solutions or suspensions in aqueous or non-aqueous liquids, edible foams or whips, and oil-in-water liquid emulsions or water-in-oil liquid emulsions.

The capsules, gelatin capsules, caplets, tablets, chewable tablets, powders or granules, used for the oral administration of a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are prepared by admixing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, together with at least one excipient using conventional pharmaceutical compounding techniques. Non-limiting examples of excipients used in oral dosage forms described herein include, but are not limited to, binders, fillers, disintegrants, lubricants, absorbents, colorants, flavors, preservatives and sweeteners.

Non-limiting examples of such binders include, but are not limited to, corn starch, potato starch, starch paste, pre-gelatinized starch, or other starches, sugars, gelatin, natural and synthetic gums such as acacia, sodium alginate, alginic acid, other alginates, tragacanth, guar gum, cellulose and its derivatives (by way of example only, ethyl cellulose, cellulose acetate, carboxymethyl cellulose calcium, sodium carboxymethylcellulose, methyl cellulose, hydroxypropyl methylcellulose and microcrystalline cellulose), magnesium aluminum silicate, polyvinyl pyrrolidone and combinations thereof.

Non-limiting examples of such fillers include, but are not limited to, talc, calcium carbonate (e.g., granules or powder), microcrystalline cellulose, powdered cellulose, dextrates, kaolin, mannitol, silicic acid, sorbitol, starch, pre-gelatinized starch, and mixtures thereof. In certain embodiments, the binder or filler in pharmaceutical compositions are present in from about 50 to about 99 weight percent of the pharmaceutical composition or dosage form.

Non-limiting examples of such disintegrants include, but are not limited to, agar-agar, alginic acid, sodium alginate, calcium carbonate, sodium carbonate, microcrystalline cellulose, croscarmellose sodium, crospovidone, polacrilin potassium, sodium starch glycolate, potato or tapioca starch, pre-gelatinized starch, other starches, clays, other algins, other celluloses, gums, and combinations thereof. In certain embodiments, the amount of disintegrant used in the pharmaceutical compositions is from about 0.5 to about 15 weight percent of disintegrant, while in other embodiments the amount is from about 1 to about 5 weight percent of disintegrant.

Non-limiting examples of such lubricants include, but are not limited to, sodium stearate, calcium stearate, magnesium stearate, stearic acid, mineral oil, light mineral oil, glycerin, sorbitol, mannitol, polyethylene glycol, other glycols, sodium lauryl sulfate, talc, hydrogenated vegetable oil (by way of example only, peanut oil, cottonseed oil, sunflower oil, sesame oil, olive oil, corn oil, and soybean oil), zinc stearate, sodium oleate, ethyl oleate, ethyl laureate, agar, silica, a syloid silica gel (AEROSIL 200, manufactured by W.R. Grace Co. of Baltimore, Md.), a coagulated aerosol of synthetic silica (marketed by Degussa Co. of Piano, Tex.), CAB-O-SIL (a pyrogenic silicon dioxide product sold by Cabot Co. of Boston, Mass.) and combinations thereof. In certain embodiments, the amount of lubricants used in the pharmaceutical compositions is in an amount of less than about 1 weight percent of the pharmaceutical compositions or dosage forms.

Non-limiting examples of such diluents include, but are not limited to, lactose, dextrose, sucrose, mannitol, sorbitol, cellulose, glycine or combinations thereof.

In certain embodiments, tablets and capsules are prepared by uniformly admixing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, with liquid carriers, finely divided solid carriers, or both, and then shaping the product into the desired presentation if necessary. In certain embodiments, tablets are prepared by compression. In other embodiments, tablets are prepared by molding.

In certain embodiments, a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, is orally administered as a controlled release dosage form. Such dosage forms are used to provide slow or controlled-release of a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof. Controlled release is obtained using, for example, hydroxypropylmethyl cellulose, other polymer matrices, gels, permeable membranes, osmotic systems, multilayer coatings, microparticles, liposomes, microspheres, or a combination thereof. In certain embodiments, controlled-release dosage forms are used to extend activity of the compound of Formula (I), reduce dosage frequency, and increase patient compliance.

Administration of compounds of Formula (I) as oral fluids such as solution, syrups and elixirs are prepared in unit dosage forms such that a given quantity of solution, syrups or elixirs contains a predetermined amount of a compound of Formula (I). Syrups are prepared by dissolving the compound in a suitably flavored aqueous solution, while elixirs are prepared through the use of a non-toxic alcoholic vehicle. Suspensions are formulated by dispersing the compound in a non-toxic vehicle. Non-limiting examples of excipients used in as oral fluids for oral administration include, but are not limited to, solubilizers, emulsifiers, flavoring agents, preservatives, and coloring agents. Non-limiting examples of solubilizers and emulsifiers include, but are not limited to, water, glycols, oils, alcohols, ethoxylated isostearyl alcohols and polyoxy ethylene sorbitol ethers. Non-limiting examples of preservatives include, but are not limited to, sodium benzoate. Non-limiting examples of flavoring agents include, but are not limited to, peppermint oil or natural sweeteners or saccharin or other artificial sweeteners.

Parenteral Dosage Forms

In certain embodiments pharmaceutical compositions containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are administered parenterally by various routes including, but not limited to, subcutaneous, intravenous (including bolus injection), intramuscular, and intraarterial.

Such parenteral dosage forms are administered in the form of sterile or sterilizable injectable solutions, suspensions, dry and/or lyophylized products ready to be dissolved or suspended in a pharmaceutically acceptable vehicle for injection (reconstitutable powders) and emulsions. Vehicles used in such dosage forms include, but are not limited to, Water for Injection USP; aqueous vehicles such as, but not limited to, Sodium Chloride Injection, Ringer's Injection, Dextrose Injection, Dextrose and Sodium Chloride Injection, and Lactated Ringer's Injection; water-miscible vehicles such as, but not limited to, ethyl alcohol, polyethylene glycol, and polypropylene glycol; and non-aqueous vehicles such as, but not limited to, corn oil, cottonseed oil, peanut oil, sesame oil, ethyl oleate, isopropyl myristate, and benzyl benzoate.

Transdermal Dosage Forms

In certain embodiments pharmaceutical compositions containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are administered transdemally. Such transdermal dosage forms include “reservoir type” or “matrix type” patches, which are applied to the skin and worn for a specific period of time to permit the penetration of a desired amount of a compound of Formula (I). By way of example only, such transdermal devices are in the form of a bandage comprising a backing member, a reservoir containing the compound optionally with carriers, optionally a rate controlling barrier to deliver the compound to the skin of the host at a controlled and predetermined rate over a prolonged period of time, and means to secure the device to the skin. In other embodiments, matrix transdermal formulations are used.

Formulations for transdermal delivery of a compound of Formula (I) include an effective amount of a compound of Formula (I), a carrier and an optional diluent. A carrier includes, but is not limited to, absorbable pharmacologically acceptable solvents to assist passage through the skin of the host, such as water, acetone, ethanol, ethylene glycol, propylene glycol, butane-1,3-diol, isopropyl myristate, isopropyl palmitate, mineral oil, and combinations thereof.

In certain embodiments, such transdermal delivery systems include penetration enhancers to assist in delivering one or more compounds of Formula (I) to the tissue. Such penetration enhancers include, but are not limited to, acetone; various alcohols such as ethanol, oleyl, and tetrahydrofuryl; alkyl sulfoxides such as dimethyl sulfoxide; dimethyl acetamide; dimethyl formamide; polyethylene glycol; pyrrolidones such as polyvinylpyrrolidone; Kollidon grades (Povidone, Polyvidone); urea; and various water-soluble or insoluble sugar esters such as Tween 80 (polysorbate 80) and Span 60 (sorbitan monostearate).

In other embodiments, the pH of such a transdermal pharmaceutical composition or dosage form, or of the tissue to which the pharmaceutical composition or dosage form is applied, is adjusted to improve delivery of one or more compounds of Formula (I). In other embodiments, the polarity of a solvent carrier, its ionic strength, or tonicity are adjusted to improve delivery. In other embodiments, compounds such as stearates are added to advantageously alter the hydrophilicity or lipophilicity of one or more compounds of Formula (I) so as to improve delivery. In certain embodiments, such stearates serve as a lipid vehicle for the formulation, as an emulsifying agent or surfactant, and as a delivery-enhancing or penetration-enhancing agent. In other embodiments, different salts, hydrates s of the compounds of Formula (I) are used to further adjust the properties of the resulting composition.

Topical Dosage Forms

In certain embodiments a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, is administered by topical application of pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, in the form of lotions, gels, ointments solutions, emulsions, suspensions or creams. Suitable formulations for topical application to the skin are aqueous solutions, ointments, creams or gels, while formulations for ophthalmic administration are aqueous solutions. Such formulations optionally contain solubilizers, stabilizers, tonicity enhancing agents, buffers and preservatives.

Such topical formulations include at least one carrier, and optionally at least one diluent. Such carriers and diluents include, but are not limited to, water, acetone, ethanol, ethylene glycol, propylene glycol, butane-1,3-diol, isopropyl myristate, isopropyl palmitate, mineral oil, and combinations thereof.

In certain embodiments, such topical formulations include penetration enhancers to assist in delivering one or more compounds of Formula (I) to the tissue. Such penetration enhancers include, but are not limited to, acetone; various alcohols such as ethanol, oleyl, and tetrahydrofuryl; alkyl sulfoxides such as dimethyl sulfoxide; dimethyl acetamide; dimethyl formamide; polyethylene glycol; pyrrolidones such as polyvinylpyrrolidone; Kollidon grades (Povidone, Polyvidone); urea; and various water-soluble or insoluble sugar esters such as Tween 80 (polysorbate 80) and Span 60 (sorbitan monostearate).

In certain embodiments pharmaceutical compositions containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are administered by inhalation. Dosage forms for inhaled administration are formulated as aerosols or dry powders. Aerosol formulations for inhalation administration comprise a solution or fine suspension of a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, in a pharmaceutically acceptable aqueous or non-aqueous solvent. In addition, such pharmaceutical compositions optionally comprise a powder base such as lactose, glucose, trehalose, mannitol or starch, and optionally a performance modifier such as L-leucine or another amino acid, and/or metals salts of stearic acid such as magnesium or calcium stearate.

In certain embodiments, compounds of Formula (I) are be administered directly to the lung by inhalation using a Metered Dose Inhaler (“MDI”), which utilizes canisters that contain a suitable low boiling propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas, or a Dry Powder Inhaler (DPI) device which uses a burst of gas to create a cloud of dry powder inside a container, which is then be inhaled by the patient. In certain embodiments, capsules and cartridges of gelatin for use in an inhaler or insufflator are formulated containing a powder mixture of a compound of Formula (I) and a powder base such as lactose or starch. In certain embodiments, compounds of Formula (I) are delivered to the lung using a liquid spray device, wherein such devices use extremely small nozzle holes to aerosolize liquid drug formulations that can then be directly inhaled into the lung. In other embodiments, compounds of Formula (I) are delivered to the lung using a nebulizer device, wherein a nebulizers creates an aerosols of liquid drug formulations by using ultrasonic energy to form fine particles that can be readily inhaled. In other embodiments, compounds of Formula (I) are delivered to the lung using an electrohydrodynamic (“EHD”) aerosol device wherein such EHD aerosol devices use electrical energy to aerosolize liquid drug solutions or suspensions.

In certain embodiments, the pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salts thereof, described herein, also contain one or more absorption enhancers. In certain embodiments, such absorption enhancers include, but are not limited to, sodium glycocholate, sodium caprate, N-lauryl-β-D-maltopyranoside, EDTA, and mixed micelles.

In certain embodiments the pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically accceptable salt thereof, are administered nasally. The dosage forms for nasal administration are formulated as aerosols, solutions, drops, gels or dry powders.

In certain embodiments the pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically accceptable salt thereof, are administered rectally in the form of suppositories, enemas, ointment, creams rectal foams or rectal gels. In certain embodiments such suppositories are prepared from fatty emulsions or suspensions, cocoa butter or other glycerides.

In certain embodiments the pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically accceptable salt thereof, are administered opthamically as eye drops. Such formulations are aqueous solutions that optionally contain solubilizers, stabilizers, tonicity enhancing agents, buffers and preservatives.

In certain embodiments the pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically accceptable salt thereof, are administered otically as ear drops. Such formulations are aqueous solutions that optionally contain solubilizers, stabilizers, tonicity enhancing agents, buffers and preservatives.

In certain embodiments the pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically accceptable salt thereof, are formulated as a depot preparation. Such formulations are administered by implantation (for example subcutaneously or intramuscularly) or by intramuscular injection. In certain embodiments, such formulations include polymeric or hydrophobic materials (for example, as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble derivatives, for example, as a sparingly soluble salt.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for oral administration for the treatment of viral infectious diseases and/or disorders associated with TLR7 activity.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for intramuscular administration for the treatment of viral infectious diseases and/or disorders associated with TLR7.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for oral administration for the treatment of infectious diseases and/or disorders associated with TLR7.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for oral administration for the treatment of bacterial diseases and/or disorders associated with TLR7.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for oral administration for the treatment of fungal diseases and/or disorders associated with TLR7.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for oral administration for the treatment of cancer associated with TLR7.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for intravenous administration for the treatment of cancer associated with TLR7.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for administration as eye drops for the treatment of ophthalmic diseases and/or disorders associated with TLR7.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for topical administration for the treatment of dermatological diseases and/or disorders associated with TLR7.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for topical administration for the treatment of actinic keratosis. In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for topical administration as a cream for the treatment of actinic keratosis.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for topical administration for the treatment of basal cell carcinoma. In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for topical administration as a cream for the treatment of basal cell carcinoma.

In a further embodiment, the pharmaceutical compositions comprising a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, are adapted for administration by inhalation for the treatment of respiratory diseases and/or disorders associated with TLR7. In certain embodiments, the respiratory disease is allergic asthma.

Provided herein are compounds of Formula (I), Formula (Ia) or Formula (Ib), and pharmaceutically acceptable salts thereof, and the pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically accceptable salt thereof, and/or pharmaceutically acceptable salts thereof, for use in activating TLR7 activity, and thereby are used to in the prevention or treatment of diseases and/or disorders associated with TLR7 activity. Such compounds of Formula (I) and pharmaceutically acceptable salts thereof, and pharmaceutical compositions are agonists of TLR7.

Also are methods for the treatment of a subject suffering from a disease and/or disorder associated with TLR7 activity, wherein the methods include administering to the subject an effective amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof, either alone or as part of a pharmaceutical composition as described herein.

Provided herein is the use of a compound of Formula (I), or a pharmaceutically acceptable salt thereof, in the preparation of a medicament for the treatment of a disease or disorder associated with TLR7 activity.

Combination Treatment

In certain embodiments, a compound of Formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, is administered alone (without an additional therapeutic agent) for the treatment of one or more of the disease and/or disorders associated with TLR7 activity described herein.

In other embodiments, a compound of Formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, is administered in combination with one or more additional therapeutic agents, for the treatment of one or more of the disease and/or disorders associated with TLR7 activity described herein.

In other embodiments, a compound of Formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, is formulated in combination with one or more additional therapeutic agents and administered for the treatment of one or more of the disease and/or disorders associated with TLR7 activity described herein.

In other embodiments, a compound of Formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, is administered sequentially with one or more additional therapeutic agents, for the treatment of one or more of the disease and/or disorders associated with TLR7 activity described herein.

In other embodiments, the combination treatments include administration of a compound of Formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I), prior to administration of one or more additional therapeutic agents, for the treatment of one or more of the disease and/or disorders associated with TLR7 activity described herein.

In other embodiments, the combination treatments include administration of a compound of Formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I), subsequent to administration of one or more additional therapeutic agents, for the treatment of one or more of the disease and/or disorders associated with TLR7 activity described herein.

In certain embodiments, the combination treatments include administration of a compound of Formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I), concurrently with one or more additional therapeutic agents, for the treatment of one or more of the disease and/or disorders associated with TLR7 activity described herein.

In certain embodiments, the combination treatments include administration of a compound of Formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I) formulated with one or more additional therapeutic agents, for the treatment of one or more of the disease and/or disorders associated with TLR7 activity described herein.

In certain embodiments of the combination therapies described herein, the compounds of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically acceptable salt thereof, and the additional therapeutics agent(s) act additively. In certain embodiments of the combination therapies described herein, the compounds of Formula (I), or pharmaceutically acceptable salts thereof, and the additional therapeutics agent(s) act synergistically.

In other embodiments, a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof, is administered to a patient who has not previously undergone or is not currently undergoing treatment with another therapeutic agent.

The additional therapeutic agents used in combination with a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically acceptable salt thereof, include, but are not limited to antibiotics or antibacterial agents, antiemetic agents, antifungal agents, anti-inflammatory agents, antiviral agents, viral enzyme inhibitors or anticancer agents.

In certain embodiments, the pharmaceutical composition containing a compound of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically acceptable salt thereof, are immunogenic compositions.

In other embodiments, the compound(s) of Formula (I), Formula (Ia) or Formula (Ib), or a pharmaceutically acceptable salt thereof, are immune potentiators and impart an immunostimulatory effect upon administration when compared to formulations that do not contain a compound of Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salt thereof.

The immunostimulatory effect referred to herein is often an enhancement of the immunogenic composition's effect. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 10% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 20% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 30% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 40% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 50% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 60% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 70% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 80% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 90% relative to the effect of the immunogenic composition in the absence of the immune potentiator. In certain embodiments the enhancement of the efficacy of the immunogenic composition is by at least 100% relative to the effect of the immunogenic composition in the absence of the immune potentiator.

The immunogenic compositions as disclosed herein may be used in a method for raising or enhancing an immune response in a mammal comprising the step of administering an effective amount of an immunogenic composition as disclosed herein. The immune response is preferably protective and preferably involves antibodies and/or cell-mediated immunity.

In certain embodimentsembodiments, the immunogenic compositions disclosed herein may be used as a medicament, e.g., for use in raising or enhancing an immune response in a mammal.

In certain embodiments, the immunogenic compositions disclosed herein may be used in the manufacture of a medicament for raising an immune response in a mammal. The mammal is preferably a human, but may be, e.g., a cow, a pig, a chicken, a cat or a dog.

One way of checking efficacy of therapeutic treatment involves monitoring pathogen infection after administration of the immunogenic compositions disclosed herein. One way of checking efficacy of prophylactic treatment involves monitoring immune responses, systemically (such as monitoring the level of IgG1 and IgG2a production) and/or mucosally (such as monitoring the level of IgA production), against the antigens included in or administered in conjunction with the immunogenic compositions disclosed herein after administration of the immunogenic composition (and the antigen if administered separately). Typically, antigen-specific serum antibody responses are determined post-immunisation but pre-challenge whereas antigen-specific mucosal antibody responses are determined post-immunisation and post-challenge.

Another way of assessing the immunogenicity of the immunogenic compositions disclosed herein where the antigen is a protein is to express the proteins recombinantly for screening patient sera or mucosal secretions by immunoblot and/or microarrays. A positive reaction between the protein and the patient sample indicates that the patient has mounted an immune response to the protein in question. This method may also be used to identify immunodominant antigens and/or epitopes within protein antigens.

The efficacy of the immunogenic compositions can also be determined in vivo by challenging appropriate animal models of the pathogen of interest infection.

The immunogenic compositions disclosed herein will generally be administered directly to a subject. Direct delivery may be accomplished by parenteral injection (e.g., subcutaneously, intraperitoneally, intravenously, intramuscularly, or to the interstitial space of a tissue), or mucosally, such as by rectal, oral (e.g., tablet, spray), vaginal, topical, transdermal or transcutaneous, intranasal, ocular, aural, pulmonary or other mucosal administration.

The immunogenic compositions may be used to elicit systemic and/or mucosal immunity, preferably to elicit an enhanced systemic and/or mucosal immunity.

Preferably the enhanced systemic and/or mucosal immunity is reflected in an enhanced TH1 and/or TH2 immune response. Preferably, the enhanced immune response includes an increase in the production of IgG1 and/or IgG2a and/or IgA.

Certain aspects and examples of the invention are provided in the following listing of enumerated embodiments. It will be recognized that features specified in each embodiment may be combined with other specified features to provide further embodiments of the present invention.

-   1. Compounds, and the pharmaceutically acceptable salts, individual     isomers and mixture of isomers thereof, have a structure according     to Formula (I):

-   -   R¹ is —NHR⁶ or —NHCHR⁶R⁹;     -   R³ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂,         —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH,         -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl;     -   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂,         —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH,         -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl;         -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹²,             —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹²,             —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,             -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl;             -   or when R⁴ is H, then R³ is -L₂R¹², —OL₂R¹²,                 —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹²,                 —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH,                 -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl;     -   L₁ is —(CH₂)_(m)—;     -   L₂ is —(CH₂)_(m)—;     -   L₇=—(CH₂)_(m)(CHR¹CH₂)_(m)(CH₂)_(n)—;     -   R⁶ is —C₃-C₆alkyl;     -   R⁷ is —C₁-C₃alkyl;     -   R⁹ is L₁OH;     -   each R¹¹ is independently selected from —OH;     -   R¹² is         -   a) an unsubstituted tetrazolyl;         -   b) a tetrazolyl substituted with -L₁C(═O)OH;         -   or         -   c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms             independently selected from N and O substituted with             —C(═O)OH;     -   each m is independently selected from 1, 2, 3, and 4,     -   and     -   each n is independently selected from 0, 1, 2, 3, and 4.

-   2. In certain embodiments, the compound of Formula (I) is a compound     of Formula (Ia) or Formula (Ib):

-   3. In certain embodiments of the compounds of Formula (I),     -   R¹ is —NHR⁶ or —NHCHR⁶R⁹;     -   R³ is H, —OL₂C(═O)OH or tetrazolyl;     -   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂,         —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH,         -L₂C(═O)OH, -L₇C(═O)OH or tetrazolyl;         -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹²,             —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹²,             —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH             or tetrazolyl;             -   or when R⁴ is H, then R³ is —OL₂C(═O)OH or tetrazolyl;     -   L₁ is —(CH₂)_(m)—;     -   L₂ is —(CH₂)_(m)—;     -   L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—;     -   R⁶ is —C₃-C₆alkyl;     -   R⁷ is —C₁-C₃alkyl; methyl     -   R⁹ is L₁OH;     -   each R¹¹ is independently selected from —OH;     -   R¹² is         -   a) an unsubstituted tetrazolyl;         -   b) a tetrazolyl substituted with -L₁C(═O)OH;         -   or         -   c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms             independently selected from N and O substituted with             —C(═O)OH;     -   each m is independently selected from 1, 2, 3, and 4,     -   and     -   each n is independently selected from 0, 1, 2, 3, and 4. -   4. In certain embodiments of the compounds of Formula (I), Formula     (Ia) or Formula (Ib),     -   R¹ is —NHR⁶ or —NHCHR⁶R⁹;     -   R³ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂,         —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH,         -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

-   -   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂,         —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH,         -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

-   -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═)OH, —OL₂C(═O)OH,

-   -   or when R⁴ is H, then R³ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

-   -   L₁ is —(CH₂)_(m)—;     -   L₂ is —(CH₂)_(m)—;     -   L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—;     -   R⁶ is —C₃-C₆alkyl;     -   R⁷ is —C₁-C₃alkyl;     -   R⁹ is L₁OH;     -   each R¹¹ is independently selected from —OH;     -   R¹² is

-   -   each m is independently selected from 1, 2, 3, and 4,     -   and     -   each n is independently selected from 0, 1, 2, 3, and 4.

-   5. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib),     -   R¹ is —NHR⁶ or —NHCHR⁶R⁹;     -   R³ is H, —OL₂C(═O)OH,

-   -   R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂,         —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH,         -L₂C(═O)OH, -L₇C(═O)OH,

-   -   where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹²,         —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH,         —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH,

-   -   or when R⁴ is H, then R³ is —OL₂C(═O)OH,

-   -   L₁ is —(CH₂)_(m)—;     -   L₂ is —(CH₂)_(m)—;     -   L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—;     -   R⁶ is —C₃-C₆alkyl;     -   R⁷ is —C₁-C₃alkyl;     -   R⁹ is L₁OH;     -   each R¹¹ is independently selected from —OH;     -   R¹² is

-   -   each m is independently selected from 1, 2, 3, and 4,     -   and     -   each n is independently selected from 0, 1, 2, 3, and 4.

-   6. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib), L₁ is —CH₂—; L₂ is —CH₂— or —CH₂CH₂—;     L₇=—(CH₂)₂(CHR¹¹CH₂)₂—; R⁶ is —C₄alkyl or —C₅alkyl; R⁷ is methyl,     ethyl or propyl, and R¹¹ is OH.

-   7. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is     —(CH₂)_(m)—; R⁶ is —C₃-C₆alkyl;     -   R¹² is         -   a) an unsubstituted tetrazolyl;         -   b) a tetrazolyl substituted with -L₁C(═O)OH;         -   or         -   c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms             independently selected from N and O substituted with             —C(═O)OH,     -   and     -   each m is independently selected from 1, 2, 3, and 4.

-   8. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is     —CH₂— or —CH₂CH₂—; R⁶ is —C₅alkyl; and     -   R¹² is

-   9. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is     —CH₂— or —CH₂CH₂—; R⁶ is —C₅alkyl; and     -   R¹² is

-   10. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is     —CH₂— or —CH₂CH₂—; R⁶ is —C₅alkyl; and     -   R¹² is

-   11. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R₁₂; L₂ is     —CH₂— or —CH₂CH₂—; R⁶ is —C₅alkyl; and     -   R¹² is

-   12. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib), R¹ is —NHR⁶; R³ is H; R⁴ is -L₂C(═O)OH; L₂ is     —CH₂— or —CH₂CH₂—; and R⁶ is —C₅alkyl. -   13. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib),     -   R¹² is

-   14. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib),     -   R¹² is

-   15. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib) the compound is selected from: -   5-(5-((1H-tetrazol-5-yl)methoxy)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine;     -   5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; -   (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)pentan-1-ol; -   5-(5-(2-(1H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   N4-hexyl-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   (S)-2-((2-amino-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; -   2-(5-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)-2H-tetrazol-2-yl)acetic     acid; -   5-(2-methoxy-4-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   (S)-2-((5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; -   5-(5-(difluoro(1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetic     acid; -   (3R,5R)-7-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-3,5-dihydroxyheptanoic     acid;     2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic     acid; -   (S)-2-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic     acid; -   3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic     acid; -   (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonic     acid; -   methyl hydrogen     (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate; -   (E)-3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylic     acid; -   3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic     acid; -   (S)-3-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic     acid; -   (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic     acid; -   (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic     acid, and -   2-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetic     acid. -   16. In certain embodiments of the compounds of Formula (I), Formula     (Ia) and Formula (Ib) the compound is selected from: -   2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic     acid; -   3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic     acid; -   5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   5-(5-(2-(1H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; -   (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic     acid, and -   (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic     acid. -   17. Another embodiment are methods of using compounds of Formula     (I), Formula (Ia) and Formula (Ib), and pharmaceutical compositions     comprising such compounds of Formula (I), Formula (Ia) and Formula     (Ib). -   18. Another embodiment are pharmaceutical compositions that include     a therapeutically effective amount of a compound of Formula (I),     Formula (Ia) or Formula (Ib), and a pharmaceutically acceptable     carrier. In certain embodiments of such pharmaceutical compositions,     the pharmaceutical composition is formulated for intravenous     administration, intravitrial administration, intramuscular     administration, oral administration, rectal administration     inhalation, nasal administration, topical administration, ophthalmic     administration or otic administration. In other embodiments, the     pharmaceutical compositions are in the form of a tablet, a pill, a     capsule, a liquid, an inhalant, a nasal spray solution, a     suppository, a solution, an emulsion, an ointment, eye drop or ear     drop. In other embodiments, such pharmaceutical compositions further     include one or more additional therapeutic agents. -   19. Another embodiment are medicaments for treating a patient with a     disease or disorder associated with TLR7 receptor activity, and such     medicaments include a therapeutically effective amount of a compound     of Formula (I), Formula (Ia) or Formula (Ib). -   20. Another embodiment is the use of a compound of Formula (I),     Formula (Ia) or Formula (Ib) in the manufacture of a medicament for     treating a disease or disorder associated with TLR7 activity. -   21. In certain embodiments of the use of a compound of Formula (I),     Formula (Ia) or Formula (Ib) in the manufacture of a medicament the     disease is an infectious disease, a viral infectious disease, an     inflammatory disease, a respiratory disease, a dermatological     disease, an autoimmune disease, a cell-proliferative disease or     cancer. -   22. In certain embodiments of such the use of a compound of Formula     (I), Formula (Ia) or Formula (Ib) in the manufacture of a medicament     the disease is asthma, chronic obstructive pulmonary disease (COPD),     adult respiratory distress syndrome (ARDS), ulcerative colitis,     Crohn's disease, bronchitis, dermatitis, actinic keratosis, basal     cell carcinoma, bladder cancer, allergic rhinitis, psoriasis,     scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis,     cancer, breast cancer, HIV, hepatitis, hepatitis C or lupus. -   23. In certain embodiments of such the use of a compound of Formula     (I), Formula (Ia) or Formula (Ib) in the manufacture of a medicament     the disease is hepatitis B, hepatitis C, colorectal cancer or     hepatocellular carcinoma. -   24. Another embodiment is methods for activating a TLR7 receptor,     wherein the method includes administering to a system or a subject     in need thereof, a therapeutically effective amount of a compound of     Formula (I), Formula (Ia) or Formula (Ib), or pharmaceutically     acceptable salts or pharmaceutical compositions thereof, thereby     activating the TLR receptor. -   25. In certain embodiments of such methods for activating a TLR7     receptor, the methods include administering the compound to a cell     or tissue system or to a human or animal subject. -   26. Another embodiment is methods for treating a disease or disorder     associated with TLR7 activity, wherein the method includes     administering to a system or subject in need of such treatment an     effective amount of a compound of Formula (I), Formula (Ia) or     Formula (Ib), or pharmaceutically acceptable salts thereof, thereby     treating the disease or disorder. -   27. In certain embodiments of such methods for treating a disease or     disorder associated with TLR7 activity, the methods include     administering the compound to a cell or tissue system or to a human     or animal subject. -   28. In certain embodiments of such methods for treating a disease or     disorder associated with TLR7 activity, the disease or condition is     an infectious disease, a viral infectious disease, an inflammatory     disease, a respiratory disease, a dermatological disease, an     autoimmune disease, a cell-proliferative disease or cancer. -   29. In certain embodiments of such methods for treating a disease or     disorder associated with TLR7 activity, the disease or condition is     asthma, chronic obstructive pulmonary disease (COPD), adult     respiratory distress syndrome (ARDS), ulcerative colitis, Crohn's     disease, bronchitis, dermatitis, actinic keratosis, basal cell     carcinoma, bladder cancer, allergic rhinitis, psoriasis,     scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis,     cancer, breast cancer, HIV, hepatitis, hepatitis C or lupus. -   30. In certain embodiments of such methods for treating a disease or     disorder associated with TLR7 activity, the disease or condition is     hepatitis B, hepatitis C, colorectal cancer or hepatocellular     carcinoma. -   31. Another embodiment is methods for treating a cell-proliferative     disease, comprising administering to a system or subject in need of     such treatment an effective amount of a compound of Formula (I),     Formula (Ia) or Formula (Ib), or pharmaceutically acceptable salts     thereof; wherein the cell-proliferative disease is bladder cancer,     lymphoma, osteosarcoma, melanoma, or a tumor of breast, renal,     prostate, colorectal, thyroid, ovarian, pancreatic, neuronal, lung,     uterine or gastrointestinal tumor. -   32. In certain embodiments of such methods for treating a     cell-proliferative disease, the the cell-proliferative disease is,     colorectal cancer or hepatocellular carcinoma. -   33. Another embodiment is compounds for use in a method of medical     treatment, wherein the method of medical treatment is for treating a     disease associated with TLR7 receptor activity, wherein the disease     is selected from an infectious disease, a viral infectious disease,     an inflammatory disease, a respiratory disease, a dermatological     disease, an autoimmune disease, a cell-proliferative disease or     cancer, and wherein the compound is a compound of Formula (I),     Formula (Ia) or Formula (Ib). -   34. In certain embodiments of such use in a method of medical     treatment, the disease or condition is asthma, chronic obstructive     pulmonary disease (COPD), adult respiratory distress syndrome     (ARDS), ulcerative colitis, Crohn's disease, bronchitis, dermatitis,     actinic keratosis, basal cell carcinoma, bladder cancer, allergic     rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis,     multiple sclerosis, cancer, breast cancer, HIV, hepatitis, hepatitis     C or lupus. -   35. In certain embodiments of such use in a method of medical     treatment, the disease is hepatitis B, hepatitis C, colorectal     cancer or hepatocellular carcinoma.

EXAMPLES

The following examples illustrate the preparation of certain exemplary compounds of Formula (I). Table 1 gives the Human TLR7 EC₅₀ (nM) values obtained using these exemplary compounds.

Synthesis Of Exemplary Compounds Example 1 5-(5-((1H-tetrazol-5-yl)methoxy)-2-methoxybenzyl)-N4-pentyl(5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

Step 1: Preparation of 4-methoxy-3-methylphenol (2)

To a round bottom flask containing 4-methoxy-3-methylbenzaldehyde (1 equiv) in CH₂Cl₂ (0.3M) was added m-CPBA (1.2 equiv) in CH₂Cl₂ (0.2M). The reaction was stirred at room temperature for 16 hours, quenched with excess saturated sodium thiosulfate (aq) and treated with excess 2N NaOH (aq). After stirring at room temperature for 16 hours, the pH was adjusted to 7 with NaHCO₃ and aqueous layer was extracted with CH₂Cl₂. The organics were dried over Na₂SO₄ and concentrated under vacuum. The title compound (2) was used crude in the next step.

Step 2: Preparation of 2-(4-methoxy-3-methylphenoxy)acetonitrile (3)

To a round bottom flask containing the 4-methoxy-3-methylphenol (2, 1 equiv) from the previous step, Cs₂CO₃ (2.5 equiv) and DMF (0.25M) was added bromoacetonitrile (2 equiv). The reaction was stirred at room temperature for 16 hours, quenched with water and extracted with ethyl acetate. The organics were dried over Na₂SO₄ and concentrated under vacuum. The residual was purified by silica gel chromatography to afford nitrile product 3.

Step 3: Preparation of 2-(3-(bromomethyl)-4-methoxyphenoxy)acetonitrile (4)

To a round bottom flask containing 2-(4-methoxy-3-methylphenoxy)acetonitrile (3, 1 equiv) from the previous step, (PhCO₂)₂ (0.01 equiv) and CCl₄ (0.25M) was added NBS (1 equiv). The reaction was stirred at 75° C. for 1 hour, concentrated under vacuum, and purified by silica gel chromatography to afford bromide 4.

Step 4: Preparation of 2-(3-((2-amino-4-chloro-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenoxy)acetonitrile (6)

To a round bottom flask containing commercially available 4-chloro-5H-pyrrolo[3,2-d]pyrimidin-2-amine 5 (1 equiv), DMF (0.25M), and Cs₂CO₃ (1.2 equiv) was added 2-(3-(bromomethyl)-4-methoxyphenoxy)acetonitrile (4, 1 equiv) from the previous step. The reaction was stirred at room temperature for 16 hours, quenched with water and extracted with ethyl acetate. The organics were dried over Na₂SO₄ and concentrated under vacuum. The title compound (6) was used crude in the next step.

Step 5: Preparation of 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenoxy)acetonitrile (7)

To a round bottom flask containing 2-(3-((2-amino-4-chloro-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenoxy)acetonitrile (6, 1 equiv) from the previous step, Cs₂CO₃ (2 equiv) and DMF (0.25M) was added pentyl amine (2 equiv). The reaction was stirred at 90° C. for 16 hours, quenched with water and extracted with ethyl acetate. The organics were dried over Na₂SO₄ and concentrated under vacuum. The residual was purified by silica gel chromatography to afford the title product 7.

Step 6: Preparation of 5-(5-((1H-tetrazol-5-yl)methoxy)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (8)

To a round bottom flask containing 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenoxy)acetonitrile (7, 1 equiv) from the previous step, Bu₂SnO (2 equiv) and NMP (0.25M) was added TMSN₃ (10 equiv). The reaction was stirred at 125° C. for 16 hours, quenched with water and extracted with ethyl acetate. The organics were dried over Na₂SO₄ and concentrated under vacuum. The residual was purified by reverse phase HPLC to afford tetrazole product 8. ¹H NMR (d-DMSO): δ 7.39 (d, 1H), 7.05 (d, 1H), 6.97 (d, 1H), 6.22 (s, 1H), 6.17 (d, 1H), 5.48 (s, 2H), 4.95 (s, 2H), 3.77 (s, 3H), 3.47-3.42 (m, 2H), 1.51-1.43 (m, 2H), 1.26-1.21 (m, 2H), 1.15-1.09 (m, 2H), 0.82 (t, 3H). LRMS [M+H]=438.2.

Example 2 5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

Step 1: Preparation of 2-(3-(bromomethyl)-4-methoxyphenyl)acetonitrile (10)

To a round bottom flask containing 2-(4-methoxy-3-methylphenyl)acetonitrile 9 (1 equiv), AIBN (0.07 equiv) and CCl₄ (0.25M) was added NBS (1.1 equiv). The reaction was stirred at 75° C. for 1 hour, concentrated under vacuum, and purified by silica gel chromatography to afford product 10.

Step 2: Preparation of 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetonitrile (12)

To a solution of commercially available 2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine 11 (1 equiv), Cs₂CO₃ (4 equiv) in DMF (0.3M) was added 2-(3-(bromomethyl)-4-methoxyphenyl)acetonitrile (10) from the previous step (1.1 equiv). The reaction mixture was 20 stirred at room temperature for 5 hours, then treated with pentylamine (3 equiv). The reaction mixture was heated to 100° C. for 16 hours, quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was purified via silica gel column chromatography to afford product 12.

Step 3: Preparation of 5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (13)

To a round bottom flask containing the 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetonitrile (12) from the previous step (1 equiv), Bu₂SnO (2 equiv) and NMP (0.25M) was added TMSN₃ (10 equiv). The reaction was stirred at 125° C. for 16 hours, quenched with water and extracted with ethyl acetate. The organics were dried over Na₂SO₄ and concentrated under vacuum. The residual was purified by reverse phase HPLC to afford tetrazole product 13. ¹H NMR (400 MHz, DMSO-d₆): δ 7.25 (d, J=3.2 Hz, 1H), 7.16 (dd, J=2.0, 8.4 Hz, 1H), 6.97 (d, J=8.8 Hz, 1H), 6.73 (d, J=2.0 Hz, 1H), 6.70 (br s, 1H), 6.62 (br s, 2H), 6.04 (d, J=3.2 Hz, 1H), 5.42 (s, 2H), 3.91 (s, 2H), 3.78 (s, 3H), 3.42-3.36 (m, 2H), 1.45-1.41 (m, 2H), 1.29-1.20 (m, 2H), 1.17-1.09 (m, 2H), 0.83 (t, J=7.2 Hz, 3H); LRMS [M+H]=422.3.

Example 3 2-(5-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[32-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)-2H-tetrazol-2-yl)acetic acid

Preparation of 2-(5-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)-2H-tetrazol-2-yl)acetic acid

To a solution of 5-(5-((2H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (13) (Example 2) in DMSO (0.15 M) was added ethyl 2-bromoacetate (0.95 equiv) and K₂CO₃ (4.0 equiv). The suspension was stirred at room temperature for 90 minutes and then purified with reverse phase HPLC to afford a white solid.

To the solution of the above white solid in EtOH/THF (1:1, v/v 0.02 M) was added 2.0 N NaOH (2.0 equiv). The solution was stirred at room temperature for 1 hour and then purified 20 with pre-HPLC to afford the title compound. TFA salt=¹H NMR (400 MHz, DMSO-d₆): δ 7.38-7.37 (m, 3H), 7.27 (t, J=5.6 Hz, 1H), 7.22 (dd, J=2.4, 8.4 Hz, 1H), 7.02 (d, J=8.4 Hz, 1H), 6.49 (d, J=1.6 Hz, 1H), 6.19 (d, J=3.2 Hz, 1H), 5.53 (s, 2H), 5.50 (s, 2H), 4.06 (s, 2H), 3.80 (s, 3H), 3.44-3.39 (m, 2H), 1.46-1.38 (m, 2H), 1.26-1.16 (m, 2H), 1.09-1.02 (m, 2H), 0.80 (t, J=7.2 Hz, 3H); LRMS [M+H]=480.2.

Example 4 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid

Preparation of 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid

2-(3-((2-Amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetonitrile (12) (Example 2, Step 2) was suspended in EtOH: 4N NaOH (v/v=1:2, 0.1 M). The reaction mixture was stirred at 80° C. overnight. After neutralization with 1 N HCl, the title compound was collected by filtration as a white solid. ¹H NMR (400 MHz, DMSO-d₆): δ(d-DMSO): δ 7.38 (d, 1H), 7.25 (br s, 2H), 7.19 (d, 1H), 7.01 (d, 1H), 6.64 (s, 1H), 6.56 (s, 1H), 6.17 (d, 1H), 5.50 (s, 2H), 3.81 (s, 3H), 3.52-3.42 (m, 2H), 3.38 (s, 2H), 1.50-1.43 (m, 2H), 1.29-1.20 (m, 2H), 1.16-1.07 (m, 2H), 0.82 (t, 3H). LRMS [M+H]=398.2.

Example 5 (S)-2-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid

Preparation of (S)-2-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid

(S)-2-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid was prepared using the same protocol as Example 4. (S)-2-aminohexan-1-ol was used instead of pentylamine. ¹H NMR (d-DMSO): δ 12.23 (s, 1H), 7.51 (d, 1H), 7.36 (br, 2H), 7.21 (d, 1H), 7.04 (d, 1H), 6.57 (s, 1H), 6.23 (d, 1H), 6.21 (d, 1H), 5.61 (d, 1H), 5.45 (d, 1H), 4.32-4.24 (m, 1H), 3.83 (s, 3H), 3.38 (s, 2H), 3.38-3.33 (m, 2H), 1.52-1.43 (m, 1H), 1.24-1.08 (m, 3H), 1.00-0.85 (m, 2H), 0.76 (t, 3H). LRMS [M+H]=428.2.

Example 6 (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol

Preparation of (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol

(S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol was prepared following the similar protocols as Example 2. (S)-2-aminohexan-1-ol was used instead of N-pentylamine. ¹H NMR (400 MHz, DMSO-d₆): δ 7.36 (d, J=3.2 Hz, 1H), 7.14 (dd, J=2.0, 8.4 Hz, 1H), 6.97 (d, J=8.8 Hz, 1H), 6.69 (d, J=1.6 Hz, 1H), 6.34 (br s, 2H), 6.07 (d, J=2.8 Hz, 1H), 5.63 (d, J=8.4 Hz, 1H), 5.46 (d, J=16.8 Hz, 1H), 5.34 (d, J=16.8 Hz, 1H), 4.28-4.20 (m, 1H), 3.88 (d, J=15.2 Hz, 1H), 3.83 (d, J=15.2 Hz, 1H), 3.80 (s, 3H), 3.42-3.31 (m, 2H), 1.52-1.41 (m, 1H), 1.27-1.12 (m, 3H), 1.05-0.95 (m, 2H), 0.78 (t, J=7.6 Hz, 3H); LRMS [M+H]=452.3.

Example 7 (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)pentan-1-ol

Preparation of (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)pentan-1-ol

(S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)pentan-1-ol was prepared following the similar protocols as Example 2. (S)-2-aminopentan-1-ol was used instead of pentylamine. ¹H NMR (400 MHz, DMSO-d₆): δ 7.45 (d, J=3.2 Hz, 1H), 7.21 (dd, J=2.0, 8.4 Hz, 1H), 6.34 (br s, 2H), 7.03 (d, J=8.4 Hz, 1H), 6.62 (d, J=2.0 Hz, 1H), 6.18 (d, J=3.2 Hz, 1H), 6.06 (d, J=8.4 Hz, 1H), 5.55 (d, J=16.8 Hz, 1H), 5.41 (d, J=16.8 Hz, 1H), 4.32-4.24 (m, 1H), 3.99 (s, 2H), 3.81 (s, 3H), 3.41-3.34 (m, 2H), 1.44-1.36 (m, 1H), 1.23-1.13 (m, 1H), 1.01-0.89 (m, 2H), 0.73 (t, J=7.2 Hz, 3H); LRMS [M+H]=438.2.

Example 8 5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

Preparation of 5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine was prepared following the similar protocols as Example 2, Steps 2-3. 3-(chloromethyl)-4-methoxybenzonitrile (McKillop, A. et al. Tetrahedron Lett., 1983, 24, 1933-36) was used instead of 2-(3-(bromomethyl)-4-methoxyphenyl)acetonitrile (10) in Step 2. ¹H NMR (400 MHz, DMSO-d₆): δ 7.87 (dd, J=2.0, 8.4 Hz, 1H), 7.35 (d, J=2.0 Hz, 1H), 7.28 (d, J=3.2 Hz, 1H), 7.09 (d, J=8.8 Hz, 1H), 5.98 (d, J=2.8 Hz, 1H), 5.61 (br s, 1H), 5.48 (br s, 2H), 5.42 (s, 2H), 3.88 (s, 3H), 3.30-3.26 (m, 2H), 1.42-1.34 (m, 2H), 1.24-1.15 (m, 2H), 1.11-1.04 (m, 2H), 0.79 (t, J=7.6 Hz, 3H); LRMS [M+H]=408.2.

Example 9 N4-hexyl-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

Preparation of N4-hexyl-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

N4-hexyl-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine was prepared following the similar protocols as Example 2, Steps 2-3. 3-(chloromethyl)-4-methoxybenzonitrile (McKillop, A. et al. Tetrahedron Lett., 1983, 24, 1933-36) was used instead of 2-(3-(bromomethyl)-4-methoxyphenyl)acetonitrile (10), and N-hexylamine was used instead of N-pentylamine in Step 2. TFA Salt=¹H NMR (400 MHz, DMSO-d₆): δ 12.3 (br s, 1H), 7.98 (d, 1H), 7.51 (d, 1H), 7.40 (br s, 2H), 7.35 (s, 1H), 7.3 (dd, 2H), 6.27 (d, 1H), 5.65 (s, 2H), 3.93 (s, 3H), 3.51-3.40 (m, 2H), 1.42-1.31 (m, 2H), 1.10-0.94 (m, 6H), 0.74 (t, 3H); LRMS [M+H]=422.3.

Example 10 (S)-2-((2-amino-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol

Preparation of (S)-2-((2-amino-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol

(S)-2-((2-amino-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol was prepared following the similar protocols as Example 2, Step 2-3. 3-(chloromethyl)-4-methoxybenzonitrile (McKillop, A. et al. Tetrahedron Lett., 1983, 24, 1933-36) was used instead of 2-(3-(bromomethyl)-4-methoxyphenyl)acetonitrile (10), and (S)-2-aminohexan-1-ol was used instead of N-pentylamine in step 2. LRMS [M+H]=438.2.

Example 11 5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

Step 1: Preparation of 5-(2-cyanopropan-2-yl)-2-methoxybenzyl methanesulfonate (15)

To a 0° C. solution of 2-(3-(hydroxymethyl)-4-methoxyphenyl)-2-methylpropanenitrile (14, 1 equiv) (Shetty, R.; Moffett, K. K. Tetrahedron Lett. 2006, 47, 8021) in CH₂Cl₂ was added Et₃N (3 equiv) and MsCl (1.2 equiv). The reaction mixture was stirred for 2 hours, quenched with water, and extracted with CH₂Cl₂. The organics were dried over Na₂SO₄ and concentrated under vacuum. The residual was used crude in the next reaction.

Step 2-3: Preparation of 5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (16)

The title compound was prepared using similar protocols as Example 2, Steps 2-3. 5-(2-cyanopropan-2-yl)-2-methoxybenzyl methanesulfonate (15) from the previous step was used instead of 2-(3-(bromomethyl)-4-methoxyphenyl)acetonitrile (10). ¹H NMR (400 MHz, DMSO-d₆): δ 7.22 (d, J=2.8 Hz, 1H), 7.10 (dd, J=2.4, 8.8 Hz, 1H), 7.01 (br s, 1H), 6.96 (br s, 2H), 6.95 (d, J=8.8 Hz, 1H), 6.53 (d, J=2.4 Hz, 1H), 6.03 (d, J=3.2 Hz, 1H), 5.43 (s, 2H), 3.77 (s, 3H), 3.43-3.36 (m, 2H), 1.56 (s, 6H), 1.48-1.41 (m, 2H), 1.28-1.18 (m, 2H), 1.13-1.06 (m, 2H), 0.82 (t, J=7.2 Hz, 3H); LRMS [M+H]=450.3.

Example 12 (S)-2-((5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol

Preparation of (S)-2-((5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol

(S)-2-((5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol was prepared following the similar protocols as Example 11. (S)-2-aminohexan-1-ol was used instead of N-pentylamine. ¹H NMR (400 MHz, DMSO-d₆): δ 7.37 (d, 1H), 7.16 (dd, 1H), 7.12 (br s, 2H), 7.01 (d, 1H), 6.25 (d, 1H), 6.15 (d, 1H), 6.07 (d, 1H), 5.56 (d, 1H), 5.44 (d, 1H), 4.26-4.16 (m, 1H), 3.81 (s, 3H), 3.35 (d, 2H), 1.58 (s, 3H), 1.53 (s, 3H), 1.39-1.24 (m, 1H), 1.24-1.08 (m, 3H), 1.00-0.84 (m, 2H), 0.75 (t, 3H); LRMS [M+H]=480.3.

Example 13 3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic acid

Step 1: Preparation of methyl 3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoate (17)

Methyl 3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoate (17) was prepared following the same protocol as Example 2, Steps 2-3. Methyl 3-(chloromethyl)-4-methoxybenzoate was used in place of 2-(3-(bromomethyl)-4-methoxyphenyl)acetonitrile (10).

Step 2: Preparation of 3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic acid (18)

To a solution of Methyl 3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoate (17 from the previous step, 1 equiv) in EtOH (0.1 M) was added 2N NaOH (2equiv). The reaction mixture was stirred at 80° C. overnight and the entire reaction was purified via reverse phase HPLC to afford product. TFA Salt=¹H NMR (400 MHz, DMSO-d₆): δ 7.90 (d, 1H), 7.50 (d, 1H), 7.41 (s, 2H), 7.37 (t, 1H), 7.15 (d, 1H), 7.13 (d, 1H), 6.24 (d, 1H), 5.60 (s, 2H), 3.91 (s, 3H), 3.44 (q, 2H), 1.46-1.38 (m, 2H), 1.20-1.10 (m, 2H), 1.03-0.95 (m, 2H), 0.76 (t, 3H). LRMS [M+H]=384.2.

Example 14 5-(2-methoxy-4-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

Step 1: Preparation of 4-((2-chloro-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzonitrile (19)

To a solution of commercially available 2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (1 equiv), Cs₂CO₃ (4 equiv) in DMF (0.3M) was added commercially available 4-(bromomethyl)-3-methoxybenzonitrile (1.1 equiv). The reaction mixture was stirred at room temperature for 5 hours, then treated with pentylamine (3 equiv). The reaction mixture was heated to 100° C. for 16 hours, quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was purified via silica gel column chromatography to afford product 19.

Step 2: Preparation of 2-azido-5-(2-methoxy-4-(1H-tetrazol-5-yl)benzyl)-N-pentyl-5H-pyrrolo[3,2-d]pyrimidin-4-amine (20)

A slurry of 4-((2-chloro-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzonitrile (19) from the previous step (1 equiv.), ZnCl₂ (10 equiv.) and NaN₃ (15 equiv.) in NMP (0.3M) was heated to 150° C. for 4 hours then cooled to room temperature and diluted with water upon which product 20 precipitates. Product 20 was isolated by vacuum filtration and used crude in the next step.

Step 3: Preparation of 5-(2-methoxy-4-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (21)

A slurry of crude 2-azido-5-(2-methoxy-4-(1H-tetrazol-5-yl)benzyl)-N-pentyl-5H-pyrrolo[3,2-d]pyrimidin-4-amine (20, from previous step, 1 equiv.) and Zn dust (30 equiv.) in AcOH (0.3M) was heated to 80° C. for 15 hours then cooled to room temperature, diluted with 10% MeOH/CH₂Cl₂ and filtered through a pad of celite. The filtrate was concentrated under vacuum and purified by reverse phase HPLC to afford product 21. TFA Salt=¹H NMR (400 MHz, DMSO-d₆): δ 12.4 (br s, 1H), 7.71 (d, J=1.6 Hz, 1H), 7.55 (dd, J=1.2, 7.6 Hz, 1H), 7.51 (d, J=3.2 Hz, 1H), 7.45 (br s, 2H), 7.35 (t, J=6.0 Hz, 1H), 6.62 (d, J=5.6 Hz, 1H), 6.26 (d, J=2.8 Hz, 1H), 5.66 (s, 2H), 3.96 (s, 3H), 3.43 (q, J=6.4 Hz, 2H), 1.45-1.37 (m, 2H), 1.17-1.08 (m, 2H), 1.02-0.95 (m, 2H), 0.67 (t, J=7.2 Hz, 3H); LRMS [M+H]=408.2.

Example 15 5-(5-(2-(1H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

Steps 1-3: Preparation of 5-(5-iodo-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (23)

To a solution of methyl 5-iodo-2-methoxybenzoate 22 (1 equiv) in THF (0.3M) at 00° C. was added DIBAL (2.1 equiv). The reaction mixture was allowed to warm to room temperature for 1 hour, then cooled to 000° C. and quenched with saturated Na₂SO₄ (aq) until a fine white solid was formed. Excess solid Na₂SO₄ was added and the reaction mixture was filtered through a pad of Celite and washed with ether. The filtrate was concentrated under vacuum to afford a white solid. The white solid was dissolved in CH₂Cl₂ (0.3M), cooled to 0° C. and treated with Et₃N (2 equiv) and MsCl (1.2 equiv). The reaction mixture was stirred for 3 hours, quenched with water and extracted with CH₂Cl₂. The organics were dried over Na₂SO₄ and concentrated under vacuum. The residual was used crude in the next reaction.

To a solution of commercially available 2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (1 equiv), Cs₂CO₃ (4 equiv) in DMF (0.3M) was added the residual from above (1.1 equiv). The reaction mixture was stirred at room temperature for 5 hours, then treated with pentylamine (3 equiv). The reaction mixture was heated to 100° C. for 16 hours, quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was purified via silica gel column chromatography to afford product 23.

Steps 4-6: Preparation of 5-(5-(2-(2H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (24)

To a solution of 5-(5-iodo-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (23) from the previous step in DMF (1.0 M) was added palladium acetate (0.3 equiv), triethylamine (1.3 equiv) and acrylonitrile (1.0 equiv). The reaction mixture was heated at 100° C. for 40 minutes with microwave. It was cooled down to room temperature and purified with reverse phase HPLC to afford the product for next reaction.

To a solution of the product above in MeOH (0.1 M) was added palladium on carbon (10% wt., 0.3 equiv) and the suspension was stirred under hydrogen for 1 hour at room temperature. The catalyst was filtered out and the filtrate was concentrated for silica gel column chromatography to afford the product. To a solution of the product above in NMP (0.1 M) was added zinc chloride (7.0 equiv) and sodium azide (7.0 equiv). The suspension was heated to 150° C. for 20 hours and cooled down for reverse phase HPLC purification to afford 5-(5-(2-(2H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (24). TFA salt=¹H NMR (400 MHz, DMSO-d₆): δ 12.16, (s, 1H), 7.36 (s, 2H), 7.31 (d, J=2.8, 1 H), 7.28 (t, J=5.6 Hz, 1H), 7.17 (dd, J=2.0, 8.4 Hz, 1H), 6.99 (d, J=8.4 Hz, 1H), 6.56 (d, J=1.6 Hz, 1H), 6.19 (d, J=2.8 Hz, 1H), 5.47 (s, 2H), 3.78 (s, 3H), 3.48-3.43 (m, 2H), 3.04 (t, J=7.2 Hz, 2H), 2.88 (t, J=7.2 Hz, 2H), 1.50-1.43 (m, 2H), 1.26-1.19 (m, 2H), 1.13-1.07 (m, 2H), 0.81 (t, J=7.2 Hz, 3H); LRMS [M+H]=436.3.

Example 16 5-(5-(difluoro(1H-tetrazol-5-yl)methy)-2-methoxybenzyl)-N4-pentyl-H-pyrrolo[3,2-d]pyrimidine-2,4-diamine

Step 1: Preparation of ethyl 2,2-difluoro-2-(4-methoxy-3-methylphenyl)acetate (26)

To a solution 4-iodo-1-methoxy-2-methylbenzene (1 equiv) and ethyl 2-bromo-2,2-difluoroacetate (2 equiv) in DMF (0.3M) was added Cu powder (3 equiv). The reaction slurry was heated to 80° C. for 1.5 days, quenched with saturated NaH₂PO₄ (aq) and extracted with ethyl acetate. The organics were dried over Na₂SO₄ and concentrated under vacuum. The residual was purified via silica gel column chromatography to afford product 26.

Steps 2-4: 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetamide (27)

Ethyl 2,2-difluoro-2-(4-methoxy-3-methylphenyl)acetate (26) from the previous step was treated with 7N ammonia in methanol (5 equiv). The reaction mixture was stirred at room temperature for 2 hours, then concentrated under vacuum to afford a white solid. The white solid was dissolved in CCl₄ (0.3M) and treated with AIBN (0.08 equiv) and NBS (1.2 equiv). The reaction slurry was stirred at 70° C. for 15 hours. The solids were removed by vacuum filtration. The filtrated was concentrated under vacuum and the residual was used crude in the next reaction.

To a solution of commercially available 2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (1 equiv), Cs₂CO₃ (4 equiv) in DMF (0.3M) was added the residual from above (1.1 equiv). The reaction mixture was stirred at room temperature for 5 hours, then treated with pentylamine (3 equiv). The reaction mixture was heated to 100° C. for 16 hours, quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was purified via silica gel column chromatography to afford product 27.

Steps 5-6: Preparation of 5-(5-(difluoro(1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (28)

To 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetamide (27) from the previous step in CH₂Cl₂ (0.1 M) at 0° C. was added pyridine (10 equiv), followed by trifluoroacetic anhydride (1.3 equiv). After 3 hours, additional trifluoroacetic anhydride (1.3 equiv) was added. The reaction mixture was stirred for an additional 3 hours, quenched with saturated NaHCO₃ (aq) and extracted with CH₂Cl₂. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was dissolved in NMP (0.3M) and treated with NaN₃ (7 equiv) and ZnCl₂ (7 equiv). The reaction mixture was heated to 100° C. for 16 hours. The reaction mixture was purified by reverse phase HPLC to afford 5-(5-(difluoro(1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (28). TFA salt=¹H NMR (400 MHz, DMSO-d₆): δ 12.22 (s, 1H), 7.53 (dd, 1H), 7.44 (d, 1H), 7.42-7.35 (m, 3H), 7.20 (d, 1H), 6.76 (d, 1H), 6.22 (d, 1H), 5.59 (s, 2H), 3.88 (s, 3H), 3.45-3.35 (m, 2H), 1.44-1.31 (m, 2H), 1.24-1.11 (m, 2H), 1.08-0.93 (m, 2H), 0.77 (t, 3H); LRMS [M+H]=458.2.

Example 17 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphen yl)-2,2-difluoroacetic acid

Steps 1-2: Preparation of ethyl 2-(3-((2-amino-4-chloro-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetate (29)

Ethyl 2,2-difluoro-2-(4-methoxy-3-methylphenyl)acetate (26) (from Example 16, Step 1) was dissolved in CCl₄ (0.3 M). NBS (1.0 equiv.) and AIBN (0.05 equiv.) were added, and the reaction mixture was stirred at 80° C. for 2 hours. It was cooled down to room temperature and concentrated. The residue was purified with silica gel column chromatography to afford a colorless oil.

To a solution of commercially available 4-chloro-5H-pyrrolo[3,2-d]pyrimidin-2-amine (1.0 equiv) and Cs₂CO₃ (1.3 equiv) in DMF was added the oil from above (1.0 equiv). The reaction mixture was stirred at room temperature for 5 hours. It was quenched with water and extracted with 10% MeOH/DCM (v/v). The combined organic extracts were concentrated and purified by silica gel column chromatography to afford the compound (29) as a white solid.

Steps 3-4: Preparation of 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetic acid (30)

To a solution of ethyl 2-(3-((2-amino-4-chloro-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetate (29) in water/MeOH (1:1 v/v, 0.3 M) from the previous step was added LiOH (1.4 equiv) and it was stirred for 10 minutes at room temperature. It was quenched with 1N HCl (1.0 equiv). The solution was concentrated and the residue was used crude for the next reaction.

To a solution of the residue above in NMP (0.1 M) was added pentyl amine (3.0 equiv). The solution was heated at 100° C. for 2 hours and cooled down to room temperature for reverse phase HPLC purification to afford 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetic acid (30) as a white solid. ¹H NMR (400 MHz, DMSO-d₆): δ 7.47-7.44 (m, 3H), 7.41 (d, J=2.8 Hz, 1H), 7.23 (s, 1H), 7.09 (d, J=8.4 Hz, 1H), 7.00 (d, J=1.6 Hz, 1H), 6.10 (d, J=3.2 Hz, 1H), 5.54 (s, 2H), 3.85 (s, 3H), 3.47-3.41 (m, 2H), 1.51-1.44 (m, 2H), 1.27-1.20 (m, 2H), 1.15-1.10 (m, 2H), 0.82 (t, J=7.2 Hz, 3H); LRMS [M+H]=434.1.

Example 18 (3R,5R)-7-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl) methyl)-4-methoxyphenyl)-3, 5-dihydroxyheptanoic acid

Steps 1-3: Preparation of 3-(((tert-butyldimethylsilyl)oxy)methyl)-4-methoxybenzaldehyde (32)

To a DMF (0.3M) solution of commercially available methyl 3-(hydroxymethybl)-4-methoxybenzoate (31) (1 equiv) was added Et₃N (3 equiv) and TBSCl (1.4 equiv). The reaction mixture was stirred at room temperature for 15 hours, quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was dissolved in THF (0.3M) and added to a 0° C. THF (0.3M) slurry of LAH (1 equiv). The reaction was allowed to warm to room temperature for 1 hour, cooled to 0° C. and quenched with saturated Na₂SO₄ (aq) until a fine white solid was formed. Excess solid Na₂SO₄ was added and the reaction mixture was filtered through a pad of Celite and washed with ether. The filtrate was concentrated under vacuum to afford a clear oil. The clear oil was dissolved in 1,4-dioxane (0.6M) and treated with MnO₂ (2.1 equiv). The reaction mixture was refluxed for 1 h, diluted with ethyl acetate and filtered through a pad of celite. The filtrate was concentrated and the residual was purified via silica gel column chromatography to afford aldehyde product 32.

Step 4: Preparation of tert-butyl 2-((4R,6S)-6-(3-(((tert-butyldimethylsilyl)oxy)methyl)-4-methoxystyryl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate (34)

To a −78° C. THF (0.3M) solution of aldehyde 32 from the previous step (1 equiv) and commercially available sulfone 33 (1.3 equiv) was added LHMDS (2.6 equiv). The reaction mixture was stirred at −78° C. for 1 hour, quenched with saturated NaHCO₃ (aq) and extract with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was purified via silica gel column chromatography to afford alkene product 34.

Steps 5-7: Preparation of tert-butyl 2-((4R,6S)-6-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxystyryl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate (35)

To a THF (0.3M) solution of alkene 34 from the previous step (1 equiv) was added 1M TBAF/THF (1.5 equiv). The reaction mixture was stirred at room temperature for 1 hour, quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was dissolved in CH₂Cl₂ (0.3M), cooled to 0° C. and treated with Et₃N (2 equiv) and MsCl (1.2 equiv). The reaction mixture was stirred for 3 hours, quenched with water and extracted with CH₂Cl₂. The organics were dried over Na₂SO₄ and concentrated under vacuum. The residual was used crude in the next reaction.

To a solution of commercially available 2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (1 equiv), Cs₂CO₃ (4 equiv) in DMF (0.3M) was added the residual from above (1.1 equiv). The reaction mixture was stirred at room temperature for 5 hours, then treated with pentylamine (3 equiv). The reaction mixture was heated to 100° C. for 16 hours, quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was purified via silica gel column chromatography to afford product 35.

Steps 8-10: Preparation of (3R,5R)-7-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-3,5-dihydroxyheptanoic acid (36)

An ethyl acetate (0.3M) slurry of tert-butyl 2-((4R,6S)-6-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxystyryl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate (35) from the previous step (1 equiv) and 10% Pd on carbon (1 equiv) was purged via bubbling with a hydrogen balloon for 15 minutes. The reaction mixture was stirred under a hydrogen atmosphere for 3 hours, dilute with ethyl acetate and filtered over a pad of celite. The filtrate was concentrated and residual was dissolved in MeCN (0.03M) and treated with 0.1 M HCl (3 equiv). The reaction mixture was stirred at room temperature for 15 hours and treated with 1 M NaOH (11 equiv). The reaction mixture was stirred for 15 hours, the pH was adjusted to 7-8 and the entire reaction was purified via reverse phase HPLC to afford product 36. ¹H NMR (400 MHz, CD₃OD): δ 7.41 (d, 1H), 7.17 (dd, 1H), 6.99 (d, 1H), 6.45 (d, 1H), 6.24 (d, 1H), 5.54-5.45 (m, 2H), 4.05-3.96 (m, 1H), 3.90 (s, 3H), 3.66-3.58 (m, 1H), 3.55-3.42 (m, 2H), 2.64-2.54 (m, 1H), 2.54-2.45 (m, 1H), 2.33-2.22 (m, 2H), 1.62-1.40 (m, 6H), 1.33-1.21 (m, 2H), 1.15-1.05 (m, 2H), 0.87 (t, 3H); LRMS [M+H]=500.3.

Example 19 (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonic acid and Example 20 methyl hydrogen (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate

Step 1: Preparation of dimethyl (4-methoxy-3-methylphenyl)phosphonate (38)

4-Iodo-1-methoxy-2-methylbenzene 37 (1 equiv., commercially available), trimethyl phosphite (1.1 equiv.), and palladium acetate (0.1 equiv.) were added to acetonitrile (0.4 M) in a microwave tube, and was irradiated at 160° C. for 1 hour with stirring. ISCO purification (silica column) afforded the title product 38 as a colorless oil.

Steps 2-3: Preparation of dimethyl (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate (39)

Dimethyl (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate (39) was prepared following the same protocol as Example 2, Steps 1-2, using dimethyl (4-methoxy-3-methylphenyl)phosphonate (38) instead of 2-(4-methoxy-3-methylphenyl)acetonitrile (9) in Step 1.

Preparation of (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonic acid (40a) and methyl hydrogen (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate (40b)

Dimethyl (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxy-phenyl)phosphonate (39) from the previous step was treated with TMSI to afford (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonic acid (40a) LRMS [M+H]=420.2, and methyl hydrogen (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate (40b) ¹H NMR (DMSO-d6): δ 12.38 (s, 1H), 7.62 (dd, 1H), 7.46 (d, 1H), 7.44 (s, 2H), 7.39 (t, 1H), 7.18 (dd, 1H), 6.83 (d, 1H), 6.23 (d, 1H), 5.60 (s, 2H), 3.87 (s, 3H), 3.43 (q, 2H), 3.35 (d, 3H), 1.48-1.38 (m, 2H), 1.24-1.16 (m, 2H), 1.10-1.01 (m, 2H), 0.80 (t, 3H). LRMS [M+H]=434.2

Example 21 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid

Step 1: Preparation of 4-bromo-2-(bromomethyl)-1-methoxybenzene (41)

4-bromo-1-methoxy-2-methylbenzene (commercially available, 1.0 equiv.) was dissolved in chloroform (0.1 M), and was treated with N-bromosuccinimide (1.1 equiv.) and azobisisobutyronitrile (AIBN, catalytic amount). The reaction mixture was stirred at reflux overnight. After cooling down to room temperature, the reaction mixture was purified by ISCO (silica gel column, EtOAc/hexanes) to afford 4-Bromo-2-(bromomethyl)-1-methoxybenzene as a white solid (41).

Step 2: Preparation of 5-(5-bromo-2-methoxybenzyl)-N⁴-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (42)

4-Chloro-5H-pyrrolo[3,2-d]pyrimidin-2-amine (commercially available, 1 equiv.) was dissolved in NMP (0.1 M) and stirred at room temperature under N₂. Potassium carbonate (1 equiv.) was added, followed by addition of 4-Bromo-2-(bromomethyl)-1-methoxybenzene 41 (from the previous step, 1 equiv.) to give a suspension. The reaction was stirred at room temperature for 18 hours and LCMS shows complete conversion. N-pentyl amine (2 equiv.) was added, followed by potassium carbonate (1 equiv.). The reaction mixture was stirred at 60° C. overnight. After cooling down to room temperature, the reaction mixture was concentrated en vacuuo, and was purified by ISCO chromatography (0-100% EtOAc in hexanes) to afford product 5-(5-Bromo-2-methoxybenzyl)-N⁴-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine 42 as a white solid.

Step 3: Preparation of (E)-ethyl 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylate (43)

5-(5-Bromo-2-methoxybenzyl)-N⁴-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine 42 (from the previous step, 1 equiv.), (E)-ethyl 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)acrylate (1.5 equiv.), tris(dibenzylideneacetone)dipalladium(0) (0.1 equiv.), 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (Sphos, 0.2 equiv.) and K₃PO₄ (2 equiv.) were dissolved in 4:1 n-butanol:water (0.1 M). After degassing with N₂, the vessel was sealed and heated at 100° C. overnight. After cooling down to room temperature, the reaction mixture was quenched with equal volume of saturated sodium bicarbonate aqueous solution, and was extracted with DCM. The organic layers were combined and dried over anhydrous sodium sulfate, and concentrated in vacuuo. The crude was purified by reverse phase prep-HPLC to afford title compound (43) as a white solid.

Step 4: Preparation of ethyl 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoate (44)

(E)-Ethyl 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylate (43) (from the previous step, 1 equiv.) and 10% palladium on carbon (0.1 equiv.) were suspended in ethanol (0.1 M). The mixture was stirred under H₂ atmosphere overnight with stirring. Solvents were removed under vacuum, and the crude was purified by ISCO (DCM-EtOAc, silica gel) to afford product (44) as white solid.

Step 5: Preparation of 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid (45)

Ethyl 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-propanoate (44) (from the previous step, 1 equiv) was dissolved in EtOH and 2N NaOH (2equiv) was added. The reaction mixture was stirred at 80° C. overnight. the entire reaction was purified via reverse phase HPLC to afford product 45. ¹H NMR (MeOD) δ 7.37 (d, 1H), 7.22 (1H), 7.01 (d, 1H), 6.67 (s, 1H), 6.22 (d, 1H), 5.49 (s, 2H), 3.89 (s, 3H), 3.53 (t, 2H), 2.76 (t, 2H), 2.46 (t, 2H), 1.52-1.45 (m, 2H), 1.36-1.24 (m, 2H), 1.18-1.10 (m, 2H), 0.88 (t, J=7.3, 3H). LRMS [M+H]=412.2

Example 22 (E)-3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylic acid

Preparation of (E)-3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylic acid

(E)-3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylic acid was prepared using similar protocols as Example 21, Step 5. (E)-ethyl 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylate (43, from Example 20, Step 3) was used instead of ethyl 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoate (44). ¹H NMR (MeOD): δ 7.61 (d, 1H), 7.51 (d, 1H), 7.40 (d, 1H), 7.13 (d, 1H), 6.95 (s, 1H), 6.26 (d, 1H), 6.18 (d, 1H), 5.56 (s, 2H), 3.94 (s, 3H), 3.55 (t, 2H), 1.52-1.44 (m, 2H), 1.30-1.21 (m, 2H), 1.14-1.07 (m, 2H), 0.84 (t, J=7.3, 3H). LRMS [M+H]=410.2

Example 23 (S)-3-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid

Preparation of (S)-3-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid

(S)-3-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid was prepared using similar protocols as Example 21. (S)-2-aminohexan-1-ol was used instead of N-pentylamine in Step 2. ¹H NMR (d-DMSO): δ 7.31 (d, 1H), 7.14 (d, 1H), 6.99 (d, 1H), 6.45 (s, 1H), 6.01 (d, 1H), 5.70 (br, 2H), 5.47 (d, 1H), 5.29 (d, 1H), 5.15 (d, 1H), 4.18-4.12 (m, 1H), 3.82 (s, 3H), 3.36-3.25 (m, 2H), 2.60 (t, 2H), 2.32 (t, 2H), 1.49-1.40 (m, 1H), 1.17-1.08 (m, 3H), 0.95-0.88 (m, 2H), 0.75 (t, 3H). LRMS [M+H]=442.2.

Example 24 (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic acid

Step a: Preparation of (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-5 methoxyphenyl)methanol (46)

To a solution of methyl 3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoate (from Example 13, Step 1) in THF (0.1M) at 0° C. was added DIBAL (4 equiv). The reaction mixture was allowed to warm to room temperature for 1 hour, cool to 0° C. and quenched with saturated Na₂SO₄ (aq) until a fine white solid was formed. Excess solid Na₂SO₄ was added and the reaction mixture was filtered through a pad of Celite. The filtrate was concentrated under vacuum and purified by ISCO (silica gel column, MeOH/DCM) to afford a white solid.

Step 2: Preparation of 5-(5-(5-(chloromethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (47)

To a solution of (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)methanol (46) (from previous step, 1 equiv) in chloroform (0.1 M) at 0° C., was added SOCl₂ (6 equiv). The reaction mixture was allowed to warm to room temperature and stirred at room temperature overnight. Then cooled to 0° C., quenched with saturated NaHCO₃ (aq), and extracted with DCM. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was used by next step without purification.

Step 3: Preparation of (R)-tert-butyl 1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylate (48)

To a solution of 5-(5-(5-(chloromethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine (47, from previous step, 1 equiv) in DCM (0.1 M) at room temperature was added (R)-tert-butyl pyrrolidine-2-carboxylate (4 equiv). The reaction mixture was stirred at room temperature overnight. The reaction mixture was concentrated under vacuum. The crude was purified by reverse phase prep-HPLC to afford title compound as a white solid.

Step 4: Preparation of (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic acid (49)

To a solution of (R)-tert-butyl 1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylate (48, from the previous step, 1 equiv) in DCM (0.5M) at room temperature was added TFA (10 equiv). The reaction mixture was stirred at room temperature for 6 hours. After the reaction mixture was concentrated under vacuum, the crude was purified by reverse phase prep-HPLC to afford title compound 49 as a white solid. ¹H NMR (d-DMSO): δ 12.58 (s, 1H), 7.48 (br, 2H), 7.47 (d, 1H), 7.36 (t, 1H), 7.32 (d, 1H), 7.16 (d, 1H), 6.77 (s, 1H), 6.21 (d, 1H), 5.54 (s, 2H), 4.19-4.13 (m, 2H), 3.84 (s, 3H), 3.46-3.41 (m, 2H), 3.31-3.25 (m, 1H), 3.10-3.04 (m, 1H), 2.41-2.32 (m, 2H), 2.02-1.93 (m, 2H), 1.88-1.75 (m, 1H), 1.50-1.42 (m, 2H), 1.29-1.20 (m, 2H), 1.15-1.07 (m, 2H), 0.81 (t, 3H). LRMS [M+H]=467.3

Example 25 (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic acid

Preparation of (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic acid

(S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic acid was prepared using similar protocols as Examples 13 and 24. Methyl 4-(chloromethyl)-3-methoxybenzoate was used instead of methyl 3-(chloromethyl)-4-methoxybenzoate in Example 13, Step 1. (S)-tert-butyl pyrrolidine-2-carboxylate was used instead of (R)-tert-butyl pyrrolidine-2-carboxylate in Example 24, Step 3. ¹H NMR (d-DMSO): δ 12.76 (s, 1H), 7.54 (br, 2H), 7.40-7.36 (m, 2H), 7.22 (s, 1H), 6.97 (d, 1H), 6.58 (d, 1H), 6.20 (d, 1H), 5.56 (s, 2H), 4.14-4.37 (m, 2H), 3.86 (s, 3H), 3.47-3.42 (m, 2H), 3.36-3.30 (m, 2H), 3.14-3.08 (m, 1H), 2.39-2.32 (m, 1H), 2.04-1.95 (m, 2H), 1.87-1.80 (m, 1H), 1.49-1.41 (m, 2H), 1.26-1.18 (m, 2H), 1.12-1.05 (m, 2H), 0.81 (t, 3H). LRMS [M+H]=467.3.

Example 26 2-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetic acid

Step 1: Preparation of methyl 2-(4-(hydroxymethyl)-3-methoxyphenoxy)acetate (50)

2-(4-(hydroxymethyl)-3-methoxyphenoxy)acetic acid (commercially available, 1 equiv) was stirred in methanol (0.5 M) at 0° C. Trimethylsilyldiazomethane (1.2 equiv.) was added in a dropwised fashion. The reaction mixture was allowed to warm to room temperature and stirred at room temperature for 1 hour, cool to 0° C., quenched with water, and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated under vacuum. The residual was used by next step without purification.

Step 2: Preparation of methyl 2-(3-methoxy-4-(((methylsulfonyl)oxy)methyl)phenoxy)acetate (51)

Methyl 2-(4-(hydroxymethyl)-3-methoxyphenoxy)acetate (50, 1 equiv) from the previous step was stirred in dichloromethane (1 M) at 0° C. Triethylamine (2.4 equiv.) and methanesulfonyl chloride (1.2 equiv.) were added in a dropwised fashion. The reaction mixture was stirred for another 1 hour at 0° C., before it was quenched with water and extracted with ethyl acetate. The organic phases were combined, dried (Na₂SO₄), and concentrated. The crude product was carried on directly to the next step.

Step 3: Preparation of methyl 2-(4-((2-chloro-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetate (52)

methyl 2-(4-((2-chloro-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetate (52) was prepared following the same protocol as Example 14, Step 1, using methyl 2-(3-methoxy-4-(((methylsulfonyl)oxy)methyl)phenoxy)acetate (51, from the previous step) in place of 4-(bromomethyl)-3-methoxybenzonitrile.

Step 4: Preparation of 2-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetic acid (53)

To a solution of methyl 2-(4-((2-chloro-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetate (52, 1 equiv., from previous step) in NMP (1 M) in microwave tube was added NH₄OH (equal volume to NMP) followed by copper(l) oxide (0.1 equiv.). The tube was capped, and the suspension was heated at 110° C. overnight. After cooling down to room temperature, the reaction mixture was purified by reverse phase prep-HPLC to afford title compound as a white solid. ¹H NMR (CDCl₃-CD₃OD): δ 7.22 (s, 1H), 6.73 (d, 1H), 6.65 (d, 1H), 6.45 (d, 1H), 6.16 (d, 1H), 5.34 (s, 2H), 4.55 (s, 2H), 3.88 (s, 3H), 3.46 (t, 2H), 1.50-1.43 (m, 2H), 1.31-1.24 (m, 2H), 1.19-1.13 (m, 2H), 0.86 (t, 3H). LRMS [M+H]=414.2.

Assays

Compounds of Formula (I) were assayed to measure their capacity as toll-like receptor 7 agonists.

Human Peripheral Blood Mononuclear Cell Assay

The bioactivity of the compounds of Formula (I) were tested in the human peripheral blood assay (human PBMC) using a panel of independent normal human donors according to approved guidelines by the institutional review committee. Human PBMC were isolated from freshly peripheral blood using a Ficoll density gradient (GE healthcare 17-1440-03). 30-35 mLs of peripheral human blood were layered onto 15 mLs of Ficoll in 50 ml conical tubes, followed by centrifugation at 1800 rpm (Eppendorf Centrifuge 5810R with biohazard caps over the tube buckets) at room temperature for 30 minutes with no acceleration and no brake. The buffy layers were then collected and transferred onto new 50 ml conical tubes and washed twice in complete media consisting of RPMI 1640 (11875085 from Invitrogen Corporation, Carlsbad, Calif.) supplemented with 10% heat inactivated fetal bovine serum (Gibco 10099-141), 1% Pen-Strep (Gibco#15140-122), 1 mM non essential amino acids (Gibco#11140-050), 1 mM sodium pyruvate (Gibco#11360-070), 2 mM L-Glutamine (Gibco#25030-081) and 1 mM HEPES (Gibco#15630-080). Viable cells were then counted using trypan blue staining, plated in 96 well flat bottom plates (Becton Dickinson #353070) at 2×10⁵ cells per well in 200 □l total volume of complete media. Compounds were then added in a 10 point dose response format starting at 100 μM, 3 fold dilution. Negative controls wells received equal concentration of DMSO. Culture supernatants were collected after 18-24 hours incubation at 37° C., 5% CO₂, stored at −20° C. until further use.

IL-6 levels in the culture supernatants were measured using a Luminex kit (Biorad). Data analysis is performed using Prism software from GraphPad (San Diego, Calif.). Dose response curves are generated for each compound and EC₅₀ values were determined as the concentration that gives 50% of the maximal signal.

Reporter Gene Assay

Human embryonic kidney 293 (HEK 293) cells were stably transfected with human TLR7 and an NF-kB-driven luciferase reporter vector (pNifty-Luciferase). As a control assay, normal Hek293 transfected with pNifty-Luc were used. Cells were cultured in DMEM supplemented with 2 mM L-glutamine, 10% heart inactivated FBS, 1% penicillin and streptomycin, 2 μg/ml puromycin (InvivoGen #ant-pr-5) and 5 μg/ml of blasticidin (Invitrogen #46-1120). Bright-Glo™ Luciferase assay buffer and substrate were supplied by Promega #E263B and #E264B (assay substrate and buffer respectively). 384 well clear-bottom plates were supplied by Greiner bio-one (#789163-G) and were custom bar-coded plates.

Cells were plated at 25,000 cells/well in 384-well plates in a final volume of 50 μl of media. Cells were allowed to adhere to the plates after overnight (18 hours) culture at 37° C. and 5% CO₂. Serially diluted experimental and positive control compounds were then dispensed to each well and incubated for 7 hours at 37° C. and 5% CO₂. Cells stimulated with DMSO alone also serve as negative controls. After the incubation, 30 μl of the pre-mix assay buffer and substrate buffer were added to each well according to manufacturer's instructions. The luminescence signal was read on a CLIPR machine with an integration time of 20 seconds per plate.

Dose response curves are generated for each compound and EC₅₀ values were determined as the concentration that gives 50% of the maximal signal.

Certain Assay Results

Various compounds of Formula (I) in free form or in pharmaceutically acceptable salt form, exhibit pharmacological properties, for example, as indicated by the in vitro tests described in this application. The EC₅₀ value in those experiments is given as that concentration of the test compound in question that provoke a response halfway between the baseline and maximum responses. In other examples, compounds of Formula (I) have EC₅₀ values in the range from 1 nM to 2 μM. In other examples, compounds of Formula (I) have EC₅₀ values in the range from 1 nM to 1 μM. In other examples, compounds of Formula (I) have EC₅₀ values in the range from 1 nM to 500 nM. In other examples, compounds of Formula (I) have EC₅₀ values in the range from 1 nM to 250 nM. In other examples, compounds of Formula (I) have EC₅₀ values in the range from 1 nM to 100 nM. In other examples, compounds of Formula (I) have EC₅₀ values in the range from 1 nM to 50 nM. In other examples, compounds of Formula (I) have EC₅₀ values in the range from 1 nM to 25 nM. In other examples, compounds of Formula (I) have EC₅₀ values in the range from 1 nM to 10 nM. Such EC₅₀ values are obtained relative to the activity of resiquimod set to 100%.

By way of example only, the EC₅₀ for TLR-7 stimulation by certain compounds of Formula (I) are listed in Table 1.

TABLE 1 Human TLR7 Example EC₅₀ (μM) Number HEK293 1 0.1 2 0.05 3 0.2 4 0.05 5 0.4 6 0.1 7 0.8 8 0.3 9 0.8 10 0.2 11 0.1 12 0.2 13 0.1 14 1.4 15 0.06 16 0.2 17 0.5 18 0.6 19 0.08 20 0.3 21 0.4 22 0.7 23 0.4 24 0.08 25 0.008 26 0.4

It is understood that the examples and embodiments described herein are for illustrative purposes only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application and scope of the appended claims. All publications, patents, and patent applications cited herein are hereby incorporated by reference for all purposes. 

We claim:
 1. A compound having the structure of Formula (I), or a pharmaceutical salt thereof:

wherein: R¹ is —NHR⁶ or —NHCHR⁶R⁹; R³ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl; R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl; where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl; or when R⁴ is H, then R³ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH or tetrazolyl; L₁ is —(CH₂)_(m)—; L₂ is —(CH₂)_(m)—; L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—; R⁶ is —C₃-C₆alkyl; R⁷ is —C₁-C₃alkyl; R⁹ is L₁OH; each R¹¹ is independently selected from —OH; R¹² is a) an unsubstituted tetrazolyl; b) a tetrazolyl substituted with -L₁C(═O)OH; or c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms independently selected from N and O substituted with —C(═O)OH; each m is independently selected from 1, 2, 3, and 4, and each n is independently selected from 0, 1, 2, 3, and
 4. 2. The compound of claim 1, wherein the compound of Formula (I) is a compound of Formula (Ia) or Formula (Ib):


3. The compound of claim 1, wherein: R¹ is —NHR⁶ or —NHCHR⁶R⁹; R³ is H, —OL₂C(═O)OH or tetrazolyl; R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH or tetrazolyl; where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH or tetrazolyl; or when R⁴ is H, then R³ is —OL₂C(═O)OH or tetrazolyl; L₁ is —(CH₂)_(m)—; L₂ is —(CH₂)_(m)—; L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—; R⁶ is —C₃-C₆alkyl; R⁷ is —C₁-C₃alkyl; methyl R⁹ is L₁OH; each R¹¹ is independently selected from —OH; R¹² is a) an unsubstituted tetrazolyl; b) a tetrazolyl substituted with —L₁C(═O)OH; or c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms independently selected from N and O substituted with —C(═O)OH; each m is independently selected from 1, 2, 3, and 4, and each n is independently selected from 0, 1, 2, 3, and
 4. 4. The compound of claim 1, wherein: R¹ is —NHR⁶ or —NHCHR⁶R⁹; R³ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

or when R⁴ is H, then R³ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH, —OL₂C(═O)OH,

L₁ is —(CH₂)_(m)—; L₂ is —(CH₂)_(m)—; L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m)(CH₂)_(n)—; R⁶ is —C₃-C₆alkyl; R⁷ is —C₁-C₃alkyl; R⁹ is L₁OH; each R¹¹ is independently selected from —OH; R¹² is

each m is independently selected from 1, 2, 3, and 4, and each n is independently selected from 0, 1, 2, 3, and
 4. 5. The compound of claim 1, wherein: R¹ is —NHR⁶ or —NHCHR⁶R⁹; R³ is H, —OL₂C(═O)OH,

R⁴ is H, -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH,

where, when R³ is H, then R⁴ is -L₂R¹², —OL₂R¹², —C(CH₃)₂R¹², —P(═O)(OH)₂, —P(═O)OH(OR⁷), —CF₂R¹², —CF₂C(═O)OH, —CH═CHC(═O)OH, —C(═O)OH, -L₂C(═O)OH, -L₇C(═O)OH,

or when R⁴ is H, then R³ is —OL₂C(═O)OH,

L₁ is —(CH₂)_(m)—; L₂ is —(CH₂)_(m)—; L₇=—(CH₂)_(m)(CHR¹¹CH₂)_(m) (CH₂)_(n)—; R⁶ is —C₃-C₆alkyl; R⁷ is —C₁-C₃alkyl; R⁹ is L₁OH; each R¹¹ is independently selected from —H; R¹² is

each m is independently selected from 1, 2, 3, and 4, and each n is independently selected from 0, 1, 2, 3, and
 4. 6. The compound of claim 1, wherein: L₁ is —CH₂—; L₂ is —CH₂— or —CH₂CH₂—; L₇=—(CH₂)₂(CHR¹¹CH₂)₂—; R⁶ is —C₄alkyl or —C₅alkyl; R⁷ is methyl, ethyl or propyl, and R¹¹ is OH.
 7. The compound of claim 1, wherein: R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is —(CH₂)_(m)—; R⁶ is —C₃-C₆alkyl; R¹² is a) an unsubstituted tetrazolyl; b) a tetrazolyl substituted with -L₁C(═O)OH; or c) a 5-6 membered heterocycloalkyl having 1 to 2 heteroatoms independently selected from N and O substituted with —C(═O)OH, and each m is independently selected from 1, 2, 3, and
 4. 8. The compound of claim 1, wherein: R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is —CH₂— or —CH₂CH₂—; R⁶ is —C₅alkyl; and R¹² is


9. The compound of claim 1, wherein: R¹ is —NHR⁶; R³ is H; R⁴ is -L₂R¹²; L₂ is —CH₂— or —CH₂CH₂—; R⁶ is —C₅alkyl; and R¹² is


10. The compound of claim 1, wherein: R₁ is —NHR⁶; R³ is H; R⁴ is -L₂C(═O)OH; L₂ is —CH₂— or —CH₂CH₂—; and R⁶ is —C₅alkyl.
 11. The compound of claim 1, wherein the compound is selected from: 5-(5-((1H-tetrazol-5-yl)methoxy)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)pentan-1-ol; 5-(5-(2-(1H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; N4-hexyl-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; (S)-2-((2-amino-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; 2-(5-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)-2H-tetrazol-2-yl)acetic acid; 5-(2-methoxy-4-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; (S)-2-((5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; 5-(5-(difluoro(1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetic acid; (3R,5R)-7-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yemethyl)-4-methoxyphenyl)-3,5-dihydroxyheptanoic acid; 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid; (S)-2-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid; 3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic acid; (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonic acid; methyl hydrogen (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate; (E)-3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylic acid; 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid; (S)-3-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid; (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic acid; (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic acid, and 2-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetic acid.
 12. The compound of claim 1, wherein the compound is selected from: 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid; 3-(2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic acid; 5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 5-(5-(2-(1H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic acid, and (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic acid.
 13. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 1 and a pharmaceutically acceptable carrier.
 14. A method for treating a disease or disorder associated with TLR7 activity, wherein the method comprises administering to a system or subject in need of such treatment an effective amount of a compound of claim
 1. 15. The method of claim 14, wherein the disease is an infectious disease, a viral infectious disease, an inflammatory disease, a respiratory disease, a dermatological disease, an autoimmune disease, a cell-proliferative disease or cancer.
 16. The method of claim 14, wherein the disease or condition is asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDS), ulcerative colitis, Crohn's disease, bronchitis, dermatitis, actinic keratosis, basal cell carcinoma, bladder cancer, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, breast cancer, HIV, hepatitis, hepatitis C or lupus.
 17. The method of claim 14, wherein the disease or condition is hepatitis B, hepatitis C, colorectal cancer or hepatocellular carcinoma.
 18. The pharmaceutical composition of claim 13, wherein the compound is selected from: 5-(5-((1H-tetrazol-5-yl)methoxy)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; (S)-2-((5-(5-((1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)pentan-1-ol; 5-(5-(2-(1H-tetrazol-5-yl)ethyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; N4-hexyl-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; (S)-2-((2-amino-5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; 2-(5-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)-2H-tetrazol-2-yl)acetic acid; 5-(2-methoxy-4-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 5-(2-methoxy-5-(1H-tetrazol-5-yl)benzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; (S)-2-((5-(5-(2-(1H-tetrazol-5-yl)propan-2-yl)-2-methoxybenzyl)-2-amino-5H-pyrrolo[3,2-d]pyrimidin-4-yl)amino)hexan-1-ol; 5-(5-(difluoro(1H-tetrazol-5-yl)methyl)-2-methoxybenzyl)-N4-pentyl-5H-pyrrolo[3,2-d]pyrimidine-2,4-diamine; 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)-2,2-difluoroacetic acid; (3R,5R)-7-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yemethyl)-4-methoxyphenyl)-3,5-dihydroxyheptanoic acid; 2-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid; (S)-2-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acetic acid; 3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzoic acid; (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonic acid; methyl hydrogen (3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)phosphonate; (E)-3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)acrylic acid; 3-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid; (S)-3-(3-((2-amino-4-((1-hydroxyhexan-2-yl)amino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxyphenyl)propanoic acid; (S)-1-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxybenzyl)pyrrolidine-2-carboxylic acid; (R)-1-(3-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-4-methoxybenzyl)pyrrolidine-2-carboxylic acid, and 2-(4-((2-amino-4-(pentylamino)-5H-pyrrolo[3,2-d]pyrimidin-5-yl)methyl)-3-methoxyphenoxy)acetic acid. 